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data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Etymology" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Etymology"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Etymology</span> </div> </a> <ul id="toc-Etymology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Definitions" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Definitions"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Definitions</span> </div> </a> <button aria-controls="toc-Definitions-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Definitions subsection</span> </button> <ul id="toc-Definitions-sublist" class="vector-toc-list"> <li id="toc-Apparent_and_mean_solar_day" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Apparent_and_mean_solar_day"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Apparent and mean solar day</span> </div> </a> <ul id="toc-Apparent_and_mean_solar_day-sublist" class="vector-toc-list"> <li id="toc-Civil_day" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Civil_day"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1.1</span> <span>Civil day</span> </div> </a> <ul id="toc-Civil_day-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Sidereal_day" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sidereal_day"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Sidereal day</span> </div> </a> <ul id="toc-Sidereal_day-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_the_International_System_of_Units" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_the_International_System_of_Units"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>In the International System of Units</span> </div> </a> <ul id="toc-In_the_International_System_of_Units-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-In_decimal_and_metric_time" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_decimal_and_metric_time"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>In decimal and metric time</span> </div> </a> <ul id="toc-In_decimal_and_metric_time-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_definitions" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other_definitions"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.5</span> <span>Other definitions</span> </div> </a> <ul id="toc-Other_definitions-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Variations_in_length" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Variations_in_length"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Variations in length</span> </div> </a> <button aria-controls="toc-Variations_in_length-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Variations in length subsection</span> </button> <ul id="toc-Variations_in_length-sublist" class="vector-toc-list"> <li id="toc-Geological_day_lengths" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Geological_day_lengths"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Geological day lengths</span> </div> </a> <ul id="toc-Geological_day_lengths-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Boundaries" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Boundaries"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Boundaries</span> </div> </a> <ul id="toc-Boundaries-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Parts" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Parts"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Parts</span> </div> </a> <button aria-controls="toc-Parts-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Parts subsection</span> </button> <ul id="toc-Parts-sublist" class="vector-toc-list"> <li id="toc-Daytime" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Daytime"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Daytime</span> </div> </a> <ul id="toc-Daytime-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Twilight" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Twilight"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2</span> <span>Twilight</span> </div> </a> <ul id="toc-Twilight-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Night" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Night"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.3</span> <span>Night</span> </div> </a> <ul id="toc-Night-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Day</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 214 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-214" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">214 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Dag" title="Dag – Afrikaans" lang="af" hreflang="af" data-title="Dag" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Tag" title="Tag – Alemannic" lang="gsw" hreflang="gsw" data-title="Tag" data-language-autonym="Alemannisch" data-language-local-name="Alemannic" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%89%80%E1%8A%95" title="ቀን – Amharic" lang="am" hreflang="am" data-title="ቀን" data-language-autonym="አማርኛ" data-language-local-name="Amharic" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-ang mw-list-item"><a href="https://ang.wikipedia.org/wiki/D%C3%A6g" title="Dæg – Old English" lang="ang" hreflang="ang" data-title="Dæg" data-language-autonym="Ænglisc" data-language-local-name="Old English" class="interlanguage-link-target"><span>Ænglisc</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%8A%D9%88%D9%85" title="يوم – Arabic" lang="ar" hreflang="ar" data-title="يوم" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/D%C3%ADa" title="Día – Aragonese" lang="an" hreflang="an" data-title="Día" data-language-autonym="Aragonés" data-language-local-name="Aragonese" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-arc mw-list-item"><a href="https://arc.wikipedia.org/wiki/%DC%9D%DC%98%DC%A1%DC%90" title="ܝܘܡܐ – Aramaic" lang="arc" hreflang="arc" data-title="ܝܘܡܐ" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="Aramaic" class="interlanguage-link-target"><span>ܐܪܡܝܐ</span></a></li><li class="interlanguage-link interwiki-roa-rup mw-list-item"><a href="https://roa-rup.wikipedia.org/wiki/Dzu%C3%A2" title="Dzuâ – Aromanian" lang="rup" hreflang="rup" data-title="Dzuâ" data-language-autonym="Armãneashti" data-language-local-name="Aromanian" class="interlanguage-link-target"><span>Armãneashti</span></a></li><li class="interlanguage-link interwiki-frp mw-list-item"><a href="https://frp.wikipedia.org/wiki/Jorn" title="Jorn – Arpitan" lang="frp" hreflang="frp" data-title="Jorn" data-language-autonym="Arpetan" data-language-local-name="Arpitan" class="interlanguage-link-target"><span>Arpetan</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%A6%E0%A6%BF%E0%A6%A8" title="দিন – Assamese" lang="as" hreflang="as" data-title="দিন" data-language-autonym="অসমীয়া" data-language-local-name="Assamese" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/D%C3%ADa" title="Día – Asturian" lang="ast" hreflang="ast" data-title="Día" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/%C3%81ra_(ta%27%C3%A3ha)" title="Ára (ta'ãha) – Guarani" lang="gn" hreflang="gn" data-title="Ára (ta'ãha)" data-language-autonym="Avañe'ẽ" data-language-local-name="Guarani" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-ay mw-list-item"><a href="https://ay.wikipedia.org/wiki/Uru" title="Uru – Aymara" lang="ay" hreflang="ay" data-title="Uru" data-language-autonym="Aymar aru" data-language-local-name="Aymara" class="interlanguage-link-target"><span>Aymar aru</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/G%C3%BCn" title="Gün – Azerbaijani" lang="az" hreflang="az" data-title="Gün" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%DA%AF%D9%88%D9%86" title="گون – South Azerbaijani" lang="azb" hreflang="azb" data-title="گون" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ban mw-list-item"><a href="https://ban.wikipedia.org/wiki/Dina" title="Dina – Balinese" lang="ban" hreflang="ban" data-title="Dina" data-language-autonym="Basa Bali" data-language-local-name="Balinese" class="interlanguage-link-target"><span>Basa Bali</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%A6%E0%A6%BF%E0%A6%A8" title="দিন – Bangla" lang="bn" hreflang="bn" data-title="দিন" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Kang_(s%C3%AE-kan)" title="Kang (sî-kan) – Minnan" lang="nan" hreflang="nan" data-title="Kang (sî-kan)" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-map-bms mw-list-item"><a href="https://map-bms.wikipedia.org/wiki/Dina" title="Dina – Banyumasan" lang="jv-x-bms" hreflang="jv-x-bms" data-title="Dina" data-language-autonym="Basa Banyumasan" data-language-local-name="Banyumasan" class="interlanguage-link-target"><span>Basa Banyumasan</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%A2%D3%99%D2%AF%D0%BB%D0%B5%D0%BA" title="Тәүлек – Bashkir" lang="ba" hreflang="ba" data-title="Тәүлек" data-language-autonym="Башҡортса" data-language-local-name="Bashkir" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A1%D1%83%D1%82%D0%BA%D1%96" title="Суткі – Belarusian" lang="be" hreflang="be" data-title="Суткі" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A1%D0%BE%D0%B4%D0%BD%D1%96" title="Содні – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Содні" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%A8" title="दिन – Bhojpuri" lang="bh" hreflang="bh" data-title="दिन" data-language-autonym="भोजपुरी" data-language-local-name="Bhojpuri" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Aldaw" title="Aldaw – Central Bikol" lang="bcl" hreflang="bcl" data-title="Aldaw" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%94%D0%B5%D0%BD%D0%BE%D0%BD%D0%BE%D1%89%D0%B8%D0%B5" title="Денонощие – Bulgarian" lang="bg" hreflang="bg" data-title="Денонощие" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Dog" title="Dog – Bavarian" lang="bar" hreflang="bar" data-title="Dog" data-language-autonym="Boarisch" data-language-local-name="Bavarian" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%89%E0%BD%B2%E0%BD%93%E0%BC%8B%E0%BD%98%E0%BD%BC%E0%BC%8D" title="ཉིན་མོ། – Tibetan" lang="bo" hreflang="bo" data-title="ཉིན་མོ།" data-language-autonym="བོད་ཡིག" data-language-local-name="Tibetan" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Dan" title="Dan – Bosnian" lang="bs" hreflang="bs" data-title="Dan" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/Deiz" title="Deiz – Breton" lang="br" hreflang="br" data-title="Deiz" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bxr mw-list-item"><a href="https://bxr.wikipedia.org/wiki/%D0%A5%D0%BE%D0%BD%D0%BE%D0%B3" title="Хоног – Russia Buriat" lang="bxr" hreflang="bxr" data-title="Хоног" data-language-autonym="Буряад" data-language-local-name="Russia Buriat" class="interlanguage-link-target"><span>Буряад</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Dia" title="Dia – Catalan" lang="ca" hreflang="ca" data-title="Dia" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%A2%D0%B0%D0%BB%C4%83%D0%BA" title="Талăк – Chuvash" lang="cv" hreflang="cv" data-title="Талăк" data-language-autonym="Чӑвашла" data-language-local-name="Chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Den" title="Den – Czech" lang="cs" hreflang="cs" data-title="Den" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-cbk-zam mw-list-item"><a href="https://cbk-zam.wikipedia.org/wiki/Dia" title="Dia – Chavacano" lang="cbk" hreflang="cbk" data-title="Dia" data-language-autonym="Chavacano de Zamboanga" data-language-local-name="Chavacano" class="interlanguage-link-target"><span>Chavacano de Zamboanga</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Musi" title="Musi – Shona" lang="sn" hreflang="sn" data-title="Musi" data-language-autonym="ChiShona" data-language-local-name="Shona" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-tum mw-list-item"><a href="https://tum.wikipedia.org/wiki/Dazi" title="Dazi – Tumbuka" lang="tum" hreflang="tum" data-title="Dazi" data-language-autonym="ChiTumbuka" data-language-local-name="Tumbuka" class="interlanguage-link-target"><span>ChiTumbuka</span></a></li><li class="interlanguage-link interwiki-co mw-list-item"><a href="https://co.wikipedia.org/wiki/Ghjornu" title="Ghjornu – Corsican" lang="co" hreflang="co" data-title="Ghjornu" data-language-autonym="Corsu" data-language-local-name="Corsican" class="interlanguage-link-target"><span>Corsu</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Diwrnod" title="Diwrnod – Welsh" lang="cy" hreflang="cy" data-title="Diwrnod" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-dag mw-list-item"><a href="https://dag.wikipedia.org/wiki/Dabisa" title="Dabisa – Dagbani" lang="dag" hreflang="dag" data-title="Dabisa" data-language-autonym="Dagbanli" data-language-local-name="Dagbani" class="interlanguage-link-target"><span>Dagbanli</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Dag" title="Dag – Danish" lang="da" hreflang="da" data-title="Dag" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D9%8A%D9%88%D9%85" title="يوم – Moroccan Arabic" lang="ary" hreflang="ary" data-title="يوم" data-language-autonym="الدارجة" data-language-local-name="Moroccan Arabic" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-se mw-list-item"><a href="https://se.wikipedia.org/wiki/J%C3%A1ndor" title="Jándor – Northern Sami" lang="se" hreflang="se" data-title="Jándor" data-language-autonym="Davvisámegiella" data-language-local-name="Northern Sami" class="interlanguage-link-target"><span>Davvisámegiella</span></a></li><li class="interlanguage-link interwiki-pdc mw-list-item"><a href="https://pdc.wikipedia.org/wiki/Daag" title="Daag – Pennsylvania German" lang="pdc" hreflang="pdc" data-title="Daag" data-language-autonym="Deitsch" data-language-local-name="Pennsylvania German" class="interlanguage-link-target"><span>Deitsch</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Tag" title="Tag – German" lang="de" hreflang="de" data-title="Tag" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-dsb mw-list-item"><a href="https://dsb.wikipedia.org/wiki/%C5%B9e%C5%84" title="Źeń – Lower Sorbian" lang="dsb" hreflang="dsb" data-title="Źeń" data-language-autonym="Dolnoserbski" data-language-local-name="Lower Sorbian" class="interlanguage-link-target"><span>Dolnoserbski</span></a></li><li class="interlanguage-link interwiki-dty mw-list-item"><a href="https://dty.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%A8" title="दिन – Doteli" lang="dty" hreflang="dty" data-title="दिन" data-language-autonym="डोटेली" data-language-local-name="Doteli" class="interlanguage-link-target"><span>डोटेली</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/%C3%96%C3%B6p%C3%A4ev" title="Ööpäev – Estonian" lang="et" hreflang="et" data-title="Ööpäev" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%97%CE%BC%CE%AD%CF%81%CE%B1" title="Ημέρα – Greek" lang="el" hreflang="el" data-title="Ημέρα" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-eml mw-list-item"><a href="https://eml.wikipedia.org/wiki/Gi%C5%8Dren" title="Giōren – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="Giōren" data-language-autonym="Emiliàn e rumagnòl" data-language-local-name="Emiliano-Romagnolo" class="interlanguage-link-target"><span>Emiliàn e rumagnòl</span></a></li><li class="interlanguage-link interwiki-myv mw-list-item"><a href="https://myv.wikipedia.org/wiki/%D0%A7%D0%B8-%D0%B2%D0%B5" title="Чи-ве – Erzya" lang="myv" hreflang="myv" data-title="Чи-ве" data-language-autonym="Эрзянь" data-language-local-name="Erzya" class="interlanguage-link-target"><span>Эрзянь</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/D%C3%ADa" title="Día – Spanish" lang="es" hreflang="es" data-title="Día" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Tago" title="Tago – Esperanto" lang="eo" hreflang="eo" data-title="Tago" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Dia" title="Dia – Extremaduran" lang="ext" hreflang="ext" data-title="Dia" data-language-autonym="Estremeñu" data-language-local-name="Extremaduran" class="interlanguage-link-target"><span>Estremeñu</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Egun" title="Egun – Basque" lang="eu" hreflang="eu" data-title="Egun" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B1%D9%88%D8%B2" title="روز – Persian" lang="fa" hreflang="fa" data-title="روز" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-hif mw-list-item"><a href="https://hif.wikipedia.org/wiki/Din" title="Din – Fiji Hindi" lang="hif" hreflang="hif" data-title="Din" data-language-autonym="Fiji Hindi" data-language-local-name="Fiji Hindi" class="interlanguage-link-target"><span>Fiji Hindi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Jour" title="Jour – French" lang="fr" hreflang="fr" data-title="Jour" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Dei" title="Dei – Western Frisian" lang="fy" hreflang="fy" data-title="Dei" data-language-autonym="Frysk" data-language-local-name="Western Frisian" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-fur mw-list-item"><a href="https://fur.wikipedia.org/wiki/D%C3%AC" title="Dì – Friulian" lang="fur" hreflang="fur" data-title="Dì" data-language-autonym="Furlan" data-language-local-name="Friulian" class="interlanguage-link-target"><span>Furlan</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/L%C3%A1" title="Lá – Irish" lang="ga" hreflang="ga" data-title="Lá" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gv mw-list-item"><a href="https://gv.wikipedia.org/wiki/Laa" title="Laa – Manx" lang="gv" hreflang="gv" data-title="Laa" data-language-autonym="Gaelg" data-language-local-name="Manx" class="interlanguage-link-target"><span>Gaelg</span></a></li><li class="interlanguage-link interwiki-gd mw-list-item"><a href="https://gd.wikipedia.org/wiki/L%C3%A0" title="Là – Scottish Gaelic" lang="gd" hreflang="gd" data-title="Là" data-language-autonym="Gàidhlig" data-language-local-name="Scottish Gaelic" class="interlanguage-link-target"><span>Gàidhlig</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/D%C3%ADa" title="Día – Galician" lang="gl" hreflang="gl" data-title="Día" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-inh mw-list-item"><a href="https://inh.wikipedia.org/wiki/%D0%94%D0%B8-%D0%B1%D0%B8%D0%B9%D1%81%D0%B0" title="Ди-бийса – Ingush" lang="inh" hreflang="inh" data-title="Ди-бийса" data-language-autonym="ГӀалгӀай" data-language-local-name="Ingush" class="interlanguage-link-target"><span>ГӀалгӀай</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/%E6%97%A5" title="日 – Gan" lang="gan" hreflang="gan" data-title="日" data-language-autonym="贛語" data-language-local-name="Gan" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%A6%E0%AA%BF%E0%AA%B5%E0%AA%B8" title="દિવસ – Gujarati" lang="gu" hreflang="gu" data-title="દિવસ" data-language-autonym="ગુજરાતી" data-language-local-name="Gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-got mw-list-item"><a href="https://got.wikipedia.org/wiki/%F0%90%8C%B3%F0%90%8C%B0%F0%90%8C%B2%F0%90%8D%83" title="𐌳𐌰𐌲𐍃 – Gothic" lang="got" hreflang="got" data-title="𐌳𐌰𐌲𐍃" data-language-autonym="𐌲𐌿𐍄𐌹𐍃𐌺" data-language-local-name="Gothic" class="interlanguage-link-target"><span>𐌲𐌿𐍄𐌹𐍃𐌺</span></a></li><li class="interlanguage-link interwiki-guw mw-list-item"><a href="https://guw.wikipedia.org/wiki/Az%C3%A1n" title="Azán – Gun" lang="guw" hreflang="guw" data-title="Azán" data-language-autonym="Gungbe" data-language-local-name="Gun" class="interlanguage-link-target"><span>Gungbe</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/Ngit" title="Ngit – Hakka Chinese" lang="hak" hreflang="hak" data-title="Ngit" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="Hakka Chinese" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-xal mw-list-item"><a href="https://xal.wikipedia.org/wiki/%D0%A5%D0%BE%D0%BD%D0%B3" title="Хонг – Kalmyk" lang="xal" hreflang="xal" data-title="Хонг" data-language-autonym="Хальмг" data-language-local-name="Kalmyk" class="interlanguage-link-target"><span>Хальмг</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%82%A0" title="날 – Korean" lang="ko" hreflang="ko" data-title="날" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/Rana_(lokaci)" title="Rana (lokaci) – Hausa" lang="ha" hreflang="ha" data-title="Rana (lokaci)" data-language-autonym="Hausa" data-language-local-name="Hausa" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%95%D6%80" title="Օր – Armenian" lang="hy" hreflang="hy" data-title="Օր" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%A8" title="दिन – Hindi" lang="hi" hreflang="hi" data-title="दिन" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hsb mw-list-item"><a href="https://hsb.wikipedia.org/wiki/D%C5%BAe%C5%84" title="Dźeń – Upper Sorbian" lang="hsb" hreflang="hsb" data-title="Dźeń" data-language-autonym="Hornjoserbsce" data-language-local-name="Upper Sorbian" class="interlanguage-link-target"><span>Hornjoserbsce</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Dan" title="Dan – Croatian" lang="hr" hreflang="hr" data-title="Dan" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Dio" title="Dio – Ido" lang="io" hreflang="io" data-title="Dio" data-language-autonym="Ido" data-language-local-name="Ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-ig mw-list-item"><a href="https://ig.wikipedia.org/wiki/%E1%BB%A4b%E1%BB%8Dch%E1%BB%8B" title="Ụbọchị – Igbo" lang="ig" hreflang="ig" data-title="Ụbọchị" data-language-autonym="Igbo" data-language-local-name="Igbo" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-ilo mw-list-item"><a href="https://ilo.wikipedia.org/wiki/Aldaw" title="Aldaw – Iloko" lang="ilo" hreflang="ilo" data-title="Aldaw" data-language-autonym="Ilokano" data-language-local-name="Iloko" class="interlanguage-link-target"><span>Ilokano</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Hari" title="Hari – Indonesian" lang="id" hreflang="id" data-title="Hari" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Die" title="Die – Interlingua" lang="ia" hreflang="ia" data-title="Die" data-language-autonym="Interlingua" data-language-local-name="Interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-ie mw-list-item"><a href="https://ie.wikipedia.org/wiki/Die" title="Die – Interlingue" lang="ie" hreflang="ie" data-title="Die" data-language-autonym="Interlingue" data-language-local-name="Interlingue" class="interlanguage-link-target"><span>Interlingue</span></a></li><li class="interlanguage-link interwiki-os mw-list-item"><a href="https://os.wikipedia.org/wiki/%D0%91%D0%BE%D0%BD" title="Бон – Ossetic" lang="os" hreflang="os" data-title="Бон" data-language-autonym="Ирон" data-language-local-name="Ossetic" class="interlanguage-link-target"><span>Ирон</span></a></li><li class="interlanguage-link interwiki-zu mw-list-item"><a href="https://zu.wikipedia.org/wiki/Usuku" title="Usuku – Zulu" lang="zu" hreflang="zu" data-title="Usuku" data-language-autonym="IsiZulu" data-language-local-name="Zulu" class="interlanguage-link-target"><span>IsiZulu</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Dagur" title="Dagur – Icelandic" lang="is" hreflang="is" data-title="Dagur" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Giorno" title="Giorno – Italian" lang="it" hreflang="it" data-title="Giorno" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%99%D7%9E%D7%9E%D7%94" title="יממה – Hebrew" lang="he" hreflang="he" data-title="יממה" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Dina" title="Dina – Javanese" lang="jv" hreflang="jv" data-title="Dina" data-language-autonym="Jawa" data-language-local-name="Javanese" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-kbp mw-list-item"><a href="https://kbp.wikipedia.org/wiki/Evemiye" title="Evemiye – Kabiye" lang="kbp" hreflang="kbp" data-title="Evemiye" data-language-autonym="Kabɩyɛ" data-language-local-name="Kabiye" class="interlanguage-link-target"><span>Kabɩyɛ</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%A6%E0%B2%BF%E0%B2%A8" title="ದಿನ – Kannada" lang="kn" hreflang="kn" data-title="ದಿನ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="Kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-krc mw-list-item"><a href="https://krc.wikipedia.org/wiki/%D0%A1%D1%83%D1%82%D0%BA%D0%B0" title="Сутка – Karachay-Balkar" lang="krc" hreflang="krc" data-title="Сутка" data-language-autonym="Къарачай-малкъар" data-language-local-name="Karachay-Balkar" class="interlanguage-link-target"><span>Къарачай-малкъар</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%93%E1%83%A6%E1%83%94-%E1%83%A6%E1%83%90%E1%83%9B%E1%83%94" title="დღე-ღამე – Georgian" lang="ka" hreflang="ka" data-title="დღე-ღამე" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ks mw-list-item"><a href="https://ks.wikipedia.org/wiki/%D8%AF%DB%84%DB%81" title="دۄہ – Kashmiri" lang="ks" hreflang="ks" data-title="دۄہ" data-language-autonym="कॉशुर / کٲشُر" data-language-local-name="Kashmiri" class="interlanguage-link-target"><span>कॉशुर / کٲشُر</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A2%D3%99%D1%83%D0%BB%D1%96%D0%BA" title="Тәулік – Kazakh" lang="kk" hreflang="kk" data-title="Тәулік" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kw mw-list-item"><a href="https://kw.wikipedia.org/wiki/Dydh" title="Dydh – Cornish" lang="kw" hreflang="kw" data-title="Dydh" data-language-autonym="Kernowek" data-language-local-name="Cornish" class="interlanguage-link-target"><span>Kernowek</span></a></li><li class="interlanguage-link interwiki-rw mw-list-item"><a href="https://rw.wikipedia.org/wiki/Umunsi" title="Umunsi – Kinyarwanda" lang="rw" hreflang="rw" data-title="Umunsi" data-language-autonym="Ikinyarwanda" data-language-local-name="Kinyarwanda" class="interlanguage-link-target"><span>Ikinyarwanda</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Siku" title="Siku – Swahili" lang="sw" hreflang="sw" data-title="Siku" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Jou_(Tan)" title="Jou (Tan) – Haitian Creole" lang="ht" hreflang="ht" data-title="Jou (Tan)" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitian Creole" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-gcr mw-list-item"><a href="https://gcr.wikipedia.org/wiki/Jou" title="Jou – Guianan Creole" lang="gcr" hreflang="gcr" data-title="Jou" data-language-autonym="Kriyòl gwiyannen" data-language-local-name="Guianan Creole" class="interlanguage-link-target"><span>Kriyòl gwiyannen</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Roj_(dem)" title="Roj (dem) – Kurdish" lang="ku" hreflang="ku" data-title="Roj (dem)" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%A1%D1%83%D1%82%D0%BA%D0%B0" title="Сутка – Kyrgyz" lang="ky" hreflang="ky" data-title="Сутка" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-mrj mw-list-item"><a href="https://mrj.wikipedia.org/wiki/%D0%9A%D0%B5%D1%87%D3%B9_(%D0%BA%D0%B0%D0%BB%D0%B5%D0%BD%D0%B4%D0%B0%D1%80%D1%8C)" title="Кечӹ (календарь) – Western Mari" lang="mrj" hreflang="mrj" data-title="Кечӹ (календарь)" data-language-autonym="Кырык мары" data-language-local-name="Western Mari" class="interlanguage-link-target"><span>Кырык мары</span></a></li><li class="interlanguage-link interwiki-lad mw-list-item"><a href="https://lad.wikipedia.org/wiki/Dia" title="Dia – Ladino" lang="lad" hreflang="lad" data-title="Dia" data-language-autonym="Ladino" data-language-local-name="Ladino" class="interlanguage-link-target"><span>Ladino</span></a></li><li class="interlanguage-link interwiki-lo mw-list-item"><a href="https://lo.wikipedia.org/wiki/%E0%BA%A1%E0%BA%B7%E0%BB%89" title="ມື້ – Lao" lang="lo" hreflang="lo" data-title="ມື້" data-language-autonym="ລາວ" data-language-local-name="Lao" class="interlanguage-link-target"><span>ລາວ</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Dies" title="Dies – Latin" lang="la" hreflang="la" data-title="Dies" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Diennakts" title="Diennakts – Latvian" lang="lv" hreflang="lv" data-title="Diennakts" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Dag" title="Dag – Luxembourgish" lang="lb" hreflang="lb" data-title="Dag" data-language-autonym="Lëtzebuergesch" data-language-local-name="Luxembourgish" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Para" title="Para – Lithuanian" lang="lt" hreflang="lt" data-title="Para" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lij mw-list-item"><a href="https://lij.wikipedia.org/wiki/Gi%C3%B3rno" title="Giórno – Ligurian" lang="lij" hreflang="lij" data-title="Giórno" data-language-autonym="Ligure" data-language-local-name="Ligurian" class="interlanguage-link-target"><span>Ligure</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Daag" title="Daag – Limburgish" lang="li" hreflang="li" data-title="Daag" data-language-autonym="Limburgs" data-language-local-name="Limburgish" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-ln mw-list-item"><a href="https://ln.wikipedia.org/wiki/Mok%C9%94l%C9%94" title="Mokɔlɔ – Lingala" lang="ln" hreflang="ln" data-title="Mokɔlɔ" data-language-autonym="Lingála" data-language-local-name="Lingala" class="interlanguage-link-target"><span>Lingála</span></a></li><li class="interlanguage-link interwiki-jbo mw-list-item"><a href="https://jbo.wikipedia.org/wiki/djedi" title="djedi – Lojban" lang="jbo" hreflang="jbo" data-title="djedi" data-language-autonym="La .lojban." data-language-local-name="Lojban" class="interlanguage-link-target"><span>La .lojban.</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/D%C3%AC" title="Dì – Lombard" lang="lmo" hreflang="lmo" data-title="Dì" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Nap_(id%C5%91egys%C3%A9g)" title="Nap (időegység) – Hungarian" lang="hu" hreflang="hu" data-title="Nap (időegység)" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mai mw-list-item"><a href="https://mai.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%A8" title="दिन – Maithili" lang="mai" hreflang="mai" data-title="दिन" data-language-autonym="मैथिली" data-language-local-name="Maithili" class="interlanguage-link-target"><span>मैथिली</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%94%D0%B5%D0%BD" title="Ден – Macedonian" lang="mk" hreflang="mk" data-title="Ден" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mg mw-list-item"><a href="https://mg.wikipedia.org/wiki/Andro" title="Andro – Malagasy" lang="mg" hreflang="mg" data-title="Andro" data-language-autonym="Malagasy" data-language-local-name="Malagasy" class="interlanguage-link-target"><span>Malagasy</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%A6%E0%B4%BF%E0%B4%B5%E0%B4%B8%E0%B4%82" title="ദിവസം – Malayalam" lang="ml" hreflang="ml" data-title="ദിവസം" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%A8" title="दिन – Marathi" lang="mr" hreflang="mr" data-title="दिन" data-language-autonym="मराठी" data-language-local-name="Marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%93%E1%83%A6%E1%83%90-%E1%83%A1%E1%83%94%E1%83%A0%E1%83%98" title="დღა-სერი – Mingrelian" lang="xmf" hreflang="xmf" data-title="დღა-სერი" data-language-autonym="მარგალური" data-language-local-name="Mingrelian" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D9%8A%D9%88%D9%85" title="يوم – Egyptian Arabic" lang="arz" hreflang="arz" data-title="يوم" data-language-autonym="مصرى" data-language-local-name="Egyptian Arabic" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-mnw mw-list-item"><a href="https://mnw.wikipedia.org/wiki/%E1%80%90%E1%80%B9%E1%81%9A%E1%80%B2_(%E1%80%A1%E1%80%81%E1%80%AD%E1%80%84%E1%80%BA)" title="တ္ၚဲ (အခိင်) – Mon" lang="mnw" hreflang="mnw" data-title="တ္ၚဲ (အခိင်)" data-language-autonym="ဘာသာမန်" data-language-local-name="Mon" class="interlanguage-link-target"><span>ဘာသာမန်</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Hari" title="Hari – Malay" lang="ms" hreflang="ms" data-title="Hari" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/N%C4%ADk" title="Nĭk – Mindong" lang="cdo" hreflang="cdo" data-title="Nĭk" data-language-autonym="閩東語 / Mìng-dĕ̤ng-ngṳ̄" data-language-local-name="Mindong" class="interlanguage-link-target"><span>閩東語 / Mìng-dĕ̤ng-ngṳ̄</span></a></li><li class="interlanguage-link interwiki-mdf mw-list-item"><a href="https://mdf.wikipedia.org/wiki/%D0%A8%D0%B8_(%D0%BF%D0%B8%D0%BD%D0%B3%D0%BE%D0%BD%D1%8C_%D0%B2%D0%B0%D0%BB)" title="Ши (пингонь вал) – Moksha" lang="mdf" hreflang="mdf" data-title="Ши (пингонь вал)" data-language-autonym="Мокшень" data-language-local-name="Moksha" class="interlanguage-link-target"><span>Мокшень</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A5%D0%BE%D0%BD%D0%BE%D0%B3" title="Хоног – Mongolian" lang="mn" hreflang="mn" data-title="Хоног" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%94%E1%80%B1%E1%80%B7" title="နေ့ – Burmese" lang="my" hreflang="my" data-title="နေ့" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-nah badge-Q70894304 mw-list-item" title=""><a href="https://nah.wikipedia.org/wiki/Tonalli" title="Tonalli – Nahuatl" lang="nah" hreflang="nah" data-title="Tonalli" data-language-autonym="Nāhuatl" data-language-local-name="Nahuatl" class="interlanguage-link-target"><span>Nāhuatl</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Siga" title="Siga – Fijian" lang="fj" hreflang="fj" data-title="Siga" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="Fijian" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Dag" title="Dag – Dutch" lang="nl" hreflang="nl" data-title="Dag" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nds-nl mw-list-item"><a href="https://nds-nl.wikipedia.org/wiki/Dag" title="Dag – Low Saxon" lang="nds-NL" hreflang="nds-NL" data-title="Dag" data-language-autonym="Nedersaksies" data-language-local-name="Low Saxon" class="interlanguage-link-target"><span>Nedersaksies</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%A8" title="दिन – Nepali" lang="ne" hreflang="ne" data-title="दिन" data-language-autonym="नेपाली" data-language-local-name="Nepali" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-new mw-list-item"><a href="https://new.wikipedia.org/wiki/%E0%A4%A6%E0%A4%BF%E0%A4%82" title="दिं – Newari" lang="new" hreflang="new" data-title="दिं" data-language-autonym="नेपाल भाषा" data-language-local-name="Newari" class="interlanguage-link-target"><span>नेपाल भाषा</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E6%97%A5" title="日 – Japanese" lang="ja" hreflang="ja" data-title="日" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-nap mw-list-item"><a href="https://nap.wikipedia.org/wiki/Juorne" title="Juorne – Neapolitan" lang="nap" hreflang="nap" data-title="Juorne" data-language-autonym="Napulitano" data-language-local-name="Neapolitan" class="interlanguage-link-target"><span>Napulitano</span></a></li><li class="interlanguage-link interwiki-ce mw-list-item"><a href="https://ce.wikipedia.org/wiki/%D0%94%D0%B5-%D0%B1%D1%83%D1%8C%D0%B9%D1%81%D0%B0" title="Де-буьйса – Chechen" lang="ce" hreflang="ce" data-title="Де-буьйса" data-language-autonym="Нохчийн" data-language-local-name="Chechen" class="interlanguage-link-target"><span>Нохчийн</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Dai" title="Dai – Northern Frisian" lang="frr" hreflang="frr" data-title="Dai" data-language-autonym="Nordfriisk" data-language-local-name="Northern Frisian" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Dag" title="Dag – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Dag" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Dag" title="Dag – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Dag" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-nrm mw-list-item"><a href="https://nrm.wikipedia.org/wiki/Jouo" title="Jouo – Norman" lang="nrf" hreflang="nrf" data-title="Jouo" data-language-autonym="Nouormand" data-language-local-name="Norman" class="interlanguage-link-target"><span>Nouormand</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Jorn" title="Jorn – Occitan" lang="oc" hreflang="oc" data-title="Jorn" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-mhr mw-list-item"><a href="https://mhr.wikipedia.org/wiki/%D0%A1%D1%83%D1%82%D0%BA%D0%B0" title="Сутка – Eastern Mari" lang="mhr" hreflang="mhr" data-title="Сутка" data-language-autonym="Олык марий" data-language-local-name="Eastern Mari" class="interlanguage-link-target"><span>Олык марий</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Sutka" title="Sutka – Uzbek" lang="uz" hreflang="uz" data-title="Sutka" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%A6%E0%A8%BF%E0%A8%A8" title="ਦਿਨ – Punjabi" lang="pa" hreflang="pa" data-title="ਦਿਨ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%AF%D9%86" title="دن – Western Punjabi" lang="pnb" hreflang="pnb" data-title="دن" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pap mw-list-item"><a href="https://pap.wikipedia.org/wiki/Dia" title="Dia – Papiamento" lang="pap" hreflang="pap" data-title="Dia" data-language-autonym="Papiamentu" data-language-local-name="Papiamento" class="interlanguage-link-target"><span>Papiamentu</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D9%88%D8%B1%DA%81" title="ورځ – Pashto" lang="ps" hreflang="ps" data-title="ورځ" data-language-autonym="پښتو" data-language-local-name="Pashto" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-jam mw-list-item"><a href="https://jam.wikipedia.org/wiki/Die" title="Die – Jamaican Creole English" lang="jam" hreflang="jam" data-title="Die" data-language-autonym="Patois" data-language-local-name="Jamaican Creole English" class="interlanguage-link-target"><span>Patois</span></a></li><li class="interlanguage-link interwiki-pcd mw-list-item"><a href="https://pcd.wikipedia.org/wiki/Jor" title="Jor – Picard" lang="pcd" hreflang="pcd" data-title="Jor" data-language-autonym="Picard" data-language-local-name="Picard" class="interlanguage-link-target"><span>Picard</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Di" title="Di – Piedmontese" lang="pms" hreflang="pms" data-title="Di" data-language-autonym="Piemontèis" data-language-local-name="Piedmontese" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-tpi mw-list-item"><a href="https://tpi.wikipedia.org/wiki/De" title="De – Tok Pisin" lang="tpi" hreflang="tpi" data-title="De" data-language-autonym="Tok Pisin" data-language-local-name="Tok Pisin" class="interlanguage-link-target"><span>Tok Pisin</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Dag" title="Dag – Low German" lang="nds" hreflang="nds" data-title="Dag" data-language-autonym="Plattdüütsch" data-language-local-name="Low German" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Doba" title="Doba – Polish" lang="pl" hreflang="pl" data-title="Doba" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Dia" title="Dia – Portuguese" lang="pt" hreflang="pt" data-title="Dia" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-kaa mw-list-item"><a href="https://kaa.wikipedia.org/wiki/K%C3%BAn_(waq%C4%B1t)" title="Kún (waqıt) – Kara-Kalpak" lang="kaa" hreflang="kaa" data-title="Kún (waqıt)" data-language-autonym="Qaraqalpaqsha" data-language-local-name="Kara-Kalpak" class="interlanguage-link-target"><span>Qaraqalpaqsha</span></a></li><li class="interlanguage-link interwiki-crh mw-list-item"><a href="https://crh.wikipedia.org/wiki/K%C3%BCn" title="Kün – Crimean Tatar" lang="crh" hreflang="crh" data-title="Kün" data-language-autonym="Qırımtatarca" data-language-local-name="Crimean Tatar" class="interlanguage-link-target"><span>Qırımtatarca</span></a></li><li class="interlanguage-link interwiki-ty mw-list-item"><a href="https://ty.wikipedia.org/wiki/Mahana" title="Mahana – Tahitian" lang="ty" hreflang="ty" data-title="Mahana" data-language-autonym="Reo tahiti" data-language-local-name="Tahitian" class="interlanguage-link-target"><span>Reo tahiti</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Zi" title="Zi – Romanian" lang="ro" hreflang="ro" data-title="Zi" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/P%27unchaw" title="P'unchaw – Quechua" lang="qu" hreflang="qu" data-title="P'unchaw" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%94%D0%B5%D0%BD%D1%8C_(%D0%BA%D0%B0%D0%BB%D0%B5%D0%BD%D0%B4%D0%B0%D1%80%D0%BD%D1%8B%D0%B9)" title="День (календарный) – Rusyn" lang="rue" hreflang="rue" data-title="День (календарный)" data-language-autonym="Русиньскый" data-language-local-name="Rusyn" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D1%83%D1%82%D0%BA%D0%B8" title="Сутки – Russian" lang="ru" hreflang="ru" data-title="Сутки" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%9A%D2%AF%D0%BD_(%D0%BA%D1%8D%D0%BC)" title="Күн (кэм) – Yakut" lang="sah" hreflang="sah" data-title="Күн (кэм)" data-language-autonym="Саха тыла" data-language-local-name="Yakut" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-sa mw-list-item"><a href="https://sa.wikipedia.org/wiki/%E0%A4%85%E0%A4%B9%E0%A5%8B%E0%A4%B0%E0%A4%BE%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%83" title="अहोरात्रः – Sanskrit" lang="sa" hreflang="sa" data-title="अहोरात्रः" data-language-autonym="संस्कृतम्" data-language-local-name="Sanskrit" class="interlanguage-link-target"><span>संस्कृतम्</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Day" title="Day – Scots" lang="sco" hreflang="sco" data-title="Day" data-language-autonym="Scots" data-language-local-name="Scots" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-nso mw-list-item"><a href="https://nso.wikipedia.org/wiki/Let%C5%A1at%C5%A1i" title="Letšatši – Northern Sotho" lang="nso" hreflang="nso" data-title="Letšatši" data-language-autonym="Sesotho sa Leboa" data-language-local-name="Northern Sotho" class="interlanguage-link-target"><span>Sesotho sa Leboa</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Dita" title="Dita – Albanian" lang="sq" hreflang="sq" data-title="Dita" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-scn mw-list-item"><a href="https://scn.wikipedia.org/wiki/Jornu" title="Jornu – Sicilian" lang="scn" hreflang="scn" data-title="Jornu" data-language-autonym="Sicilianu" data-language-local-name="Sicilian" class="interlanguage-link-target"><span>Sicilianu</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%AF%E0%B7%80%E0%B7%83" title="දවස – Sinhala" lang="si" hreflang="si" data-title="දවස" data-language-autonym="සිංහල" data-language-local-name="Sinhala" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Day" title="Day – Simple English" lang="en-simple" hreflang="en-simple" data-title="Day" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%DA%8F%D9%8A%D9%86%DA%BE%D9%86" title="ڏينھن – Sindhi" lang="sd" hreflang="sd" data-title="ڏينھن" data-language-autonym="سنڌي" data-language-local-name="Sindhi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/De%C5%88" title="Deň – Slovak" lang="sk" hreflang="sk" data-title="Deň" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Dan" title="Dan – Slovenian" lang="sl" hreflang="sl" data-title="Dan" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Maalin" title="Maalin – Somali" lang="so" hreflang="so" data-title="Maalin" data-language-autonym="Soomaaliga" data-language-local-name="Somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%95%DB%86%DA%98" title="ڕۆژ – Central Kurdish" lang="ckb" hreflang="ckb" data-title="ڕۆژ" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target"><span>کوردی</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%94%D0%B0%D0%BD" title="Дан – Serbian" lang="sr" hreflang="sr" data-title="Дан" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Dan" title="Dan – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Dan" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-su mw-list-item"><a href="https://su.wikipedia.org/wiki/Po%C3%A9" title="Poé – Sundanese" lang="su" hreflang="su" data-title="Poé" data-language-autonym="Sunda" data-language-local-name="Sundanese" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Vuorokausi" title="Vuorokausi – Finnish" lang="fi" hreflang="fi" data-title="Vuorokausi" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Dygn" title="Dygn – Swedish" lang="sv" hreflang="sv" data-title="Dygn" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Araw_(panahon)" title="Araw (panahon) – Tagalog" lang="tl" hreflang="tl" data-title="Araw (panahon)" data-language-autonym="Tagalog" data-language-local-name="Tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%A8%E0%AE%BE%E0%AE%B3%E0%AF%8D" title="நாள் – Tamil" lang="ta" hreflang="ta" data-title="நாள்" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-shi mw-list-item"><a href="https://shi.wikipedia.org/wiki/Ass" title="Ass – Tachelhit" lang="shi" hreflang="shi" data-title="Ass" data-language-autonym="Taclḥit" data-language-local-name="Tachelhit" class="interlanguage-link-target"><span>Taclḥit</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Ass" title="Ass – Kabyle" lang="kab" hreflang="kab" data-title="Ass" data-language-autonym="Taqbaylit" data-language-local-name="Kabyle" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%A2%D3%99%D2%AF%D0%BB%D0%B5%D0%BA" title="Тәүлек – Tatar" lang="tt" hreflang="tt" data-title="Тәүлек" data-language-autonym="Татарча / tatarça" data-language-local-name="Tatar" class="interlanguage-link-target"><span>Татарча / tatarça</span></a></li><li class="interlanguage-link interwiki-tay mw-list-item"><a href="https://tay.wikipedia.org/wiki/kkayal_sa_ryax_na_%27tayal" title="kkayal sa ryax na 'tayal – Tayal" lang="tay" hreflang="tay" data-title="kkayal sa ryax na 'tayal" data-language-autonym="Tayal" data-language-local-name="Tayal" class="interlanguage-link-target"><span>Tayal</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%B0%E0%B1%8B%E0%B0%9C%E0%B1%81" title="రోజు – Telugu" lang="te" hreflang="te" data-title="రోజు" data-language-autonym="తెలుగు" data-language-local-name="Telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A7%E0%B8%B1%E0%B8%99" title="วัน – Thai" lang="th" hreflang="th" data-title="วัน" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%A0%D3%AF%D0%B7" title="Рӯз – Tajik" lang="tg" hreflang="tg" data-title="Рӯз" data-language-autonym="Тоҷикӣ" data-language-local-name="Tajik" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/G%C3%BCn" title="Gün – Turkish" lang="tr" hreflang="tr" data-title="Gün" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-kcg mw-list-item"><a href="https://kcg.wikipedia.org/wiki/A%CC%B1tuk" title="A̱tuk – Tyap" lang="kcg" hreflang="kcg" data-title="A̱tuk" data-language-autonym="Tyap" data-language-local-name="Tyap" class="interlanguage-link-target"><span>Tyap</span></a></li><li class="interlanguage-link interwiki-bug mw-list-item"><a href="https://bug.wikipedia.org/wiki/%E1%A8%95%E1%A8%99%E1%A8%94%E1%A8%9A" title="ᨕᨙᨔᨚ – Buginese" lang="bug" hreflang="bug" data-title="ᨕᨙᨔᨚ" data-language-autonym="Basa Ugi" data-language-local-name="Buginese" class="interlanguage-link-target"><span>Basa Ugi</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%94%D0%BE%D0%B1%D0%B0" title="Доба – Ukrainian" lang="uk" hreflang="uk" data-title="Доба" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%AF%D9%86" title="دن – Urdu" lang="ur" hreflang="ur" data-title="دن" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-ug mw-list-item"><a href="https://ug.wikipedia.org/wiki/%D9%83%DB%88%D9%86" title="كۈن – Uyghur" lang="ug" hreflang="ug" data-title="كۈن" data-language-autonym="ئۇيغۇرچە / Uyghurche" data-language-local-name="Uyghur" class="interlanguage-link-target"><span>ئۇيغۇرچە / Uyghurche</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/Ngoenz" title="Ngoenz – Zhuang" lang="za" hreflang="za" data-title="Ngoenz" data-language-autonym="Vahcuengh" data-language-local-name="Zhuang" class="interlanguage-link-target"><span>Vahcuengh</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/P%C3%A4ivez" title="Päivez – Veps" lang="vep" hreflang="vep" data-title="Päivez" data-language-autonym="Vepsän kel’" data-language-local-name="Veps" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ng%C3%A0y" title="Ngày – Vietnamese" lang="vi" hreflang="vi" data-title="Ngày" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-vo mw-list-item"><a href="https://vo.wikipedia.org/wiki/Del" title="Del – Volapük" lang="vo" hreflang="vo" data-title="Del" data-language-autonym="Volapük" data-language-local-name="Volapük" class="interlanguage-link-target"><span>Volapük</span></a></li><li class="interlanguage-link interwiki-fiu-vro mw-list-item"><a href="https://fiu-vro.wikipedia.org/wiki/P%C3%A4iv_(aom%C3%B5%C3%B5t)" title="Päiv (aomõõt) – Võro" lang="vro" hreflang="vro" data-title="Päiv (aomõõt)" data-language-autonym="Võro" data-language-local-name="Võro" class="interlanguage-link-target"><span>Võro</span></a></li><li class="interlanguage-link interwiki-wa mw-list-item"><a href="https://wa.wikipedia.org/wiki/Djo%C3%BB" title="Djoû – Walloon" lang="wa" hreflang="wa" data-title="Djoû" data-language-autonym="Walon" data-language-local-name="Walloon" class="interlanguage-link-target"><span>Walon</span></a></li><li class="interlanguage-link interwiki-zh-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E6%97%A5_(%E6%9B%86%E6%B3%95)" title="日 (曆法) – Literary Chinese" lang="lzh" hreflang="lzh" data-title="日 (曆法)" data-language-autonym="文言" data-language-local-name="Literary Chinese" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Adlaw_(oras)" title="Adlaw (oras) – Waray" lang="war" hreflang="war" data-title="Adlaw (oras)" data-language-autonym="Winaray" data-language-local-name="Waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wo mw-list-item"><a href="https://wo.wikipedia.org/wiki/B%C3%A9s" title="Bés – Wolof" lang="wo" hreflang="wo" data-title="Bés" data-language-autonym="Wolof" data-language-local-name="Wolof" class="interlanguage-link-target"><span>Wolof</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E6%97%A5" title="日 – Wu" lang="wuu" hreflang="wuu" data-title="日" data-language-autonym="吴语" data-language-local-name="Wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-ts mw-list-item"><a href="https://ts.wikipedia.org/wiki/Siku" title="Siku – Tsonga" lang="ts" hreflang="ts" data-title="Siku" data-language-autonym="Xitsonga" data-language-local-name="Tsonga" class="interlanguage-link-target"><span>Xitsonga</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%98%D7%90%D7%92" title="טאג – Yiddish" lang="yi" hreflang="yi" data-title="טאג" data-language-autonym="ייִדיש" data-language-local-name="Yiddish" class="interlanguage-link-target"><span>ייִדיש</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/%E1%BB%8Cj%E1%BB%8D%CC%81" title="Ọjọ́ – Yoruba" lang="yo" hreflang="yo" data-title="Ọjọ́" data-language-autonym="Yorùbá" data-language-local-name="Yoruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%97%A5_(%E6%9B%86%E6%B3%95)" title="日 (曆法) – Cantonese" lang="yue" hreflang="yue" data-title="日 (曆法)" data-language-autonym="粵語" data-language-local-name="Cantonese" class="interlanguage-link-target"><span>粵語</span></a></li><li class="interlanguage-link interwiki-diq mw-list-item"><a href="https://diq.wikipedia.org/wiki/Roce_(zeman)" title="Roce (zeman) – Zazaki" lang="diq" hreflang="diq" data-title="Roce (zeman)" data-language-autonym="Zazaki" data-language-local-name="Zazaki" class="interlanguage-link-target"><span>Zazaki</span></a></li><li class="interlanguage-link interwiki-bat-smg mw-list-item"><a href="https://bat-smg.wikipedia.org/wiki/Para" title="Para – Samogitian" lang="sgs" hreflang="sgs" data-title="Para" data-language-autonym="Žemaitėška" data-language-local-name="Samogitian" class="interlanguage-link-target"><span>Žemaitėška</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%97%A5" title="日 – Chinese" lang="zh" hreflang="zh" data-title="日" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-ann mw-list-item"><a href="https://ann.wikipedia.org/wiki/Usen" title="Usen – Obolo" lang="ann" hreflang="ann" data-title="Usen" data-language-autonym="Obolo" data-language-local-name="Obolo" class="interlanguage-link-target"><span>Obolo</span></a></li><li class="interlanguage-link interwiki-kge mw-list-item"><a href="https://kge.wikipedia.org/wiki/Harani" title="Harani – Komering" lang="kge" hreflang="kge" data-title="Harani" data-language-autonym="Kumoring" data-language-local-name="Komering" class="interlanguage-link-target"><span>Kumoring</span></a></li><li class="interlanguage-link interwiki-zgh mw-list-item"><a href="https://zgh.wikipedia.org/wiki/%E2%B4%B0%E2%B5%99%E2%B5%99" title="ⴰⵙⵙ – Standard Moroccan Tamazight" lang="zgh" hreflang="zgh" data-title="ⴰⵙⵙ" data-language-autonym="ⵜⴰⵎⴰⵣⵉⵖⵜ ⵜⴰⵏⴰⵡⴰⵢⵜ" data-language-local-name="Standard Moroccan Tamazight" class="interlanguage-link-target"><span>ⵜⴰⵎⴰⵣⵉⵖⵜ ⵜⴰⵏⴰⵡⴰⵢⵜ</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q573#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Day" title="View the content page [c]" accesskey="c"><span>Article</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Talk:Day" rel="discussion" title="Discuss improvements to the content page 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<div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Time of one rotation around a planet axis</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For the part of the day when there is daylight, see <a href="/wiki/Daytime" title="Daytime">Daytime</a>. For other uses, see <a href="/wiki/Day_(disambiguation)" class="mw-disambig" title="Day (disambiguation)">Day (disambiguation)</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1237032888/mw-parser-output/.tmulti">.mw-parser-output .tmulti .multiimageinner{display:flex;flex-direction:column}.mw-parser-output .tmulti .trow{display:flex;flex-direction:row;clear:left;flex-wrap:wrap;width:100%;box-sizing:border-box}.mw-parser-output .tmulti .tsingle{margin:1px;float:left}.mw-parser-output .tmulti .theader{clear:both;font-weight:bold;text-align:center;align-self:center;background-color:transparent;width:100%}.mw-parser-output .tmulti .thumbcaption{background-color:transparent}.mw-parser-output .tmulti .text-align-left{text-align:left}.mw-parser-output .tmulti .text-align-right{text-align:right}.mw-parser-output .tmulti .text-align-center{text-align:center}@media all and (max-width:720px){.mw-parser-output .tmulti .thumbinner{width:100%!important;box-sizing:border-box;max-width:none!important;align-items:center}.mw-parser-output .tmulti .trow{justify-content:center}.mw-parser-output .tmulti .tsingle{float:none!important;max-width:100%!important;box-sizing:border-box;text-align:center}.mw-parser-output .tmulti .tsingle .thumbcaption{text-align:left}.mw-parser-output .tmulti .trow>.thumbcaption{text-align:center}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .tmulti .multiimageinner img{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .tmulti .multiimageinner img{background-color:white}}</style><div class="thumb tmulti tright"><div class="thumbinner multiimageinner" style="width:392px;max-width:392px"><div class="trow"><div class="tsingle" style="width:390px;max-width:390px"><div class="thumbimage" style="height:77px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg" class="mw-file-description"><img alt="Midtown Manhattan at afternoon" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg/388px-Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg" decoding="async" width="388" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg/582px-Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg/776px-Midtown_Manhattan_from_Weehawken_September_2021_panorama_1.jpg 2x" data-file-width="25000" data-file-height="5000" /></a></span></div></div></div><div class="trow"><div class="tsingle" style="width:390px;max-width:390px"><div class="thumbimage" style="height:77px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg" class="mw-file-description"><img alt="Midtown Manhattan at sunset" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg/388px-Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg" decoding="async" width="388" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/05/Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg/582px-Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/05/Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg/776px-Midtown_Manhattan_from_Weehawken_September_2021_panorama_2.jpg 2x" data-file-width="25000" data-file-height="5000" /></a></span></div></div></div><div class="trow"><div class="tsingle" style="width:390px;max-width:390px"><div class="thumbimage" style="height:77px;overflow:hidden"><span typeof="mw:File"><a href="/wiki/File:Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg" class="mw-file-description"><img alt="Midtown Manhattan at evening" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg/388px-Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg" decoding="async" width="388" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg/582px-Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg/776px-Midtown_Manhattan_from_Weehawken_September_2021_HDR_panorama.jpg 2x" data-file-width="25000" data-file-height="5000" /></a></span></div></div></div><div class="trow" style="display:flex"><div class="thumbcaption">A quarter-day cycle at <a href="/wiki/Midtown_Manhattan" title="Midtown Manhattan">Midtown Manhattan</a>, from afternoon to dusk</div></div></div></div> <p>A <b>day</b> is the <a href="/wiki/Time" title="Time">time</a> <a href="/wiki/Rotation_period" class="mw-redirect" title="Rotation period">period</a> of a full <a href="/wiki/Earth%27s_rotation" title="Earth's rotation">rotation of the Earth</a> with respect to the <a href="/wiki/Sun" title="Sun">Sun</a>. On average, this is 24 <a href="/wiki/Hour" title="Hour">hours</a> (86,400 <a href="/wiki/Second" title="Second">seconds</a>). As a day passes at a given location it experiences <a href="/wiki/Morning" title="Morning">morning</a>, <a href="/wiki/Noon" title="Noon">noon</a>, <a href="/wiki/Afternoon" title="Afternoon">afternoon</a>, <a href="/wiki/Evening" title="Evening">evening</a>, and <a href="/wiki/Night" title="Night">night</a>. This daily cycle drives <a href="/wiki/Circadian_rhythm" title="Circadian rhythm">circadian rhythms</a> in many organisms, which are vital to many <a href="/wiki/Life" title="Life">life</a> processes. </p><p>A collection of sequential days is organized into <a href="/wiki/Calendar" title="Calendar">calendars</a> as <a href="/wiki/Calendar_date" title="Calendar date">dates</a>, almost always into <a href="/wiki/Week" title="Week">weeks</a>, <a href="/wiki/Month" title="Month">months</a> and <a href="/wiki/Year" title="Year">years</a>. A <a href="/wiki/Solar_calendar" title="Solar calendar">solar calendar</a> organizes dates based on the Sun's annual cycle, giving consistent start dates for the <a href="/wiki/Season" title="Season">four seasons</a> from year to year. A <a href="/wiki/Lunar_calendar" title="Lunar calendar">lunar calendar</a> organizes dates based on the <a href="/wiki/Moon" title="Moon">Moon</a>'s <a href="/wiki/Lunar_phase" title="Lunar phase">lunar phase</a>. </p><p>In common usage, a day starts at <a href="/wiki/Midnight" title="Midnight">midnight</a>, written as 00:00 or <a href="/wiki/12_am" class="mw-redirect" title="12 am">12:00 am</a> in <a href="/wiki/24-hour_clock" title="24-hour clock">24-</a> or <a href="/wiki/12-hour_clock" title="12-hour clock">12-hour clocks</a>, respectively. Because the time of midnight varies between locations, <a href="/wiki/Time_zone" title="Time zone">time zones</a> are set up to facilitate the use of a uniform <a href="/wiki/Standard_time" title="Standard time">standard time</a>. Other conventions are sometimes used, for example the <a href="/wiki/Hebrew_calendar" title="Hebrew calendar">Jewish religious calendar</a> counts days from sunset to sunset, so the <a href="/wiki/Sabbath#Judaism" title="Sabbath">Jewish Sabbath</a> begins at sundown on <a href="/wiki/Friday" title="Friday">Friday</a>. In <a href="/wiki/Astronomy" title="Astronomy">astronomy</a>, a day begins at noon so that observations throughout a single night are recorded as happening on the same day. </p><p>In specific applications, the definition of a day is slightly modified, such as in the <a href="/wiki/International_System_of_Units" title="International System of Units">SI</a> day (exactly 86,400 <a href="/wiki/Second" title="Second">seconds</a>) used for <a href="/wiki/Computer" title="Computer">computers</a> and <a href="/wiki/Time_metrology" class="mw-redirect" title="Time metrology">standards keeping</a>, <a href="/wiki/Local_mean_time" title="Local mean time">local mean time</a> accounting of the <a href="/wiki/Day_length_fluctuations" title="Day length fluctuations">Earth's natural fluctuation of a solar day</a>, and <a href="/wiki/Stellar_day" class="mw-redirect" title="Stellar day">stellar day</a> and <a href="/wiki/Sidereal_time" title="Sidereal time">sidereal day</a> (using the <a href="/wiki/Celestial_sphere" title="Celestial sphere">celestial sphere</a>) used for <a href="/wiki/Astronomy" title="Astronomy">astronomy</a>. In most countries outside of the <a href="/wiki/Tropics" title="Tropics">tropics</a>, <a href="/wiki/Daylight_saving_time" title="Daylight saving time">daylight saving time</a> is practiced, and each year there will be one 23-hour civil day and one 25-hour civil day. Due to slight variations in the rotation of the Earth, there are rare times when a <a href="/wiki/Leap_second" title="Leap second">leap second</a> will get inserted at the end of a <a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">UTC</a> day, and so while almost all days have a duration of 86,400 seconds, there are these exceptional cases of a day with 86,401 seconds (in the half-century spanning 1972 through 2022, there have been a total of 27 leap seconds that have been inserted, so roughly once every other year). </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Etymology">Etymology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=1" title="Edit section: Etymology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The term comes from the <a href="/wiki/Old_English" title="Old English">Old English</a> term <i>dæġ</i> (<span class="IPA nowrap" lang="und-Latn-fonipa" title="Representation in the International Phonetic Alphabet (IPA)">/dæj/</span>), with its cognates such as <i>dagur</i> in <a href="/wiki/Icelandic_language" title="Icelandic language">Icelandic</a>, <i>Tag</i> in <a href="/wiki/German_language" title="German language">German</a>, and <i>dag</i> in <a href="/wiki/Norwegian_language" title="Norwegian language">Norwegian</a>, <a href="/wiki/Danish_language" title="Danish language">Danish</a>, <a href="/wiki/Swedish_language" title="Swedish language">Swedish</a> and <a href="/wiki/Dutch_language" title="Dutch language">Dutch</a> – all stemming from a <a href="/wiki/Proto-Germanic" class="mw-redirect" title="Proto-Germanic">Proto-Germanic</a> root <i>*dagaz</i>.<sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Definitions">Definitions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=2" title="Edit section: Definitions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Apparent_and_mean_solar_day">Apparent and mean solar day</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=3" title="Edit section: Apparent and mean solar day"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:EpicEarth-Globespin-tilt-23.4.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a0/EpicEarth-Globespin-tilt-23.4.gif/220px-EpicEarth-Globespin-tilt-23.4.gif" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a0/EpicEarth-Globespin-tilt-23.4.gif/330px-EpicEarth-Globespin-tilt-23.4.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a0/EpicEarth-Globespin-tilt-23.4.gif/440px-EpicEarth-Globespin-tilt-23.4.gif 2x" data-file-width="1500" data-file-height="1500" /></a><figcaption>Earth's rotation imaged by <a href="/wiki/Deep_Space_Climate_Observatory" title="Deep Space Climate Observatory">Deep Space Climate Observatory</a>, showing axis tilt</figcaption></figure> <p>Several definitions of this universal human concept are used according to context, need, and convenience. Besides the day of 24 hours (86,400 seconds), the word <i>day</i> is used for several different spans of time based on the rotation of the Earth around its axis. An important one is the <i>solar day</i>, the time it takes for the Sun to return to its culmination point (its highest point in the sky). Due to an orbit's eccentricity, the Sun resides in one of the orbit's foci instead of the middle. Consequently, due to <a href="/wiki/Kepler%27s_laws_of_planetary_motion#Second_law" title="Kepler's laws of planetary motion">Kepler's second law</a>, the planet travels at different speeds at various positions in its orbit, and thus a solar day is not the same length of time throughout the orbital year. Because the Earth moves along an <a href="/wiki/Semi-major_and_semi-minor_axes#Semi-major_and_semi-minor_axes_of_the_planets" title="Semi-major and semi-minor axes">eccentric orbit</a> around the Sun while the Earth spins on an inclined axis, this period can be up to 7.9 seconds more than (or less than) 24 hours. In recent decades, the average length of a solar day on Earth has been about 86,400.002 seconds<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> (24.000 000 6 hours). There are currently about 365.2421875 solar days in one mean <a href="/wiki/Tropical_year" title="Tropical year">tropical year</a>. </p><p>Ancient custom has a new day starting at either the rising or setting of the Sun on the local horizon (Italian reckoning, for example, being 24 hours from sunset, old style).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The exact moment of, and the interval between, two sunrises or sunsets depends on the geographical position (<a href="/wiki/Longitude" title="Longitude">longitude</a> and latitude, as well as altitude), and the time of <a href="/wiki/Year" title="Year">year</a> (as indicated by ancient hemispherical <a href="/wiki/Sundial" title="Sundial">sundials</a>). </p><p>A more constant day can be defined by the Sun passing through the local <a href="/wiki/Meridian_(geography)" title="Meridian (geography)">meridian</a>, which happens at local <a href="/wiki/Noon" title="Noon">noon</a> (upper <a href="/wiki/Culmination" title="Culmination">culmination</a>) or <a href="/wiki/Midnight" title="Midnight">midnight</a> (lower culmination). The exact moment is dependent on the geographical longitude, and to a lesser extent on the time of the year. The length of such a day is nearly constant (24 hours ± 30 seconds). This is the time as indicated by modern sundials. </p><p>A further improvement defines a fictitious mean Sun that moves with constant speed along the <a href="/wiki/Celestial_equator" title="Celestial equator">celestial equator</a>; the speed is the same as the average speed of the real Sun, but this removes the variation over a year as the Earth moves along its orbit around the Sun (due to both its velocity and its axial tilt). </p><p>In terms of Earth's rotation, the average day length is about 360.9856°. A day lasts for more than 360° of rotation because of the Earth's revolution around the Sun. With a full year being slightly more than 360 days, the Earth's daily orbit around the Sun is slightly less than 1°, so the day is slightly less than 361° of rotation. </p><p>Elsewhere in the <a href="/wiki/Solar_System" title="Solar System">Solar System</a> or other parts of the <a href="/wiki/Universe" title="Universe">universe</a>, a day is a full rotation of other large <a href="/wiki/Astronomical_object" title="Astronomical object">astronomical objects</a> with respect to its star.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Civil_day">Civil day</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=4" title="Edit section: Civil day"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>For civil purposes, a common clock time is typically defined for an entire region based on the local mean solar time at a central meridian. Such <a href="/wiki/Time_zone" title="Time zone"><i> time zones</i></a> began to be adopted about the middle of the 19th century when <a href="/wiki/Rail_transport" title="Rail transport">railroads</a> with regularly occurring schedules came into use, with most major countries having adopted them by 1929. As of 2015, throughout the world, 40 such zones are now in use: the central zone, from which all others are defined as offsets, is known as <a href="/wiki/UTC%2B00:00" title="UTC+00:00">UTC+00</a>, which uses <a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">Coordinated Universal Time (UTC)</a>. </p><p>The most common convention starts the civil day at <a href="/wiki/Midnight" title="Midnight">midnight</a>: this is near the time of the <a href="/wiki/Culmination" title="Culmination">lower culmination</a> of the Sun on the central meridian of the time zone. Such a day may be called a <a href="/wiki/Calendar_day" title="Calendar day">calendar day</a>. </p><p>A day is commonly divided into 24 hours, with each hour being made up of 60 minutes, and each minute composed of 60 seconds. </p> <div class="mw-heading mw-heading3"><h3 id="Sidereal_day">Sidereal day<span class="anchor" id="Extraterrestrial_bodies"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=5" title="Edit section: Sidereal day"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="/wiki/Earth%27s_rotation#Stellar_day" title="Earth's rotation">Earth's rotation § Stellar day</a>, <a href="/wiki/Sidereal_time" title="Sidereal time">Sidereal time</a>, and <a href="/wiki/Rotation_period" class="mw-redirect" title="Rotation period">Rotation period</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/04/PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif/220px-PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif" decoding="async" width="220" height="189" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/04/PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif/330px-PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/04/PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif/440px-PIA19547-Ceres-DwarfPlanet-Dawn-RC3-Animation-20150504.gif 2x" data-file-width="774" data-file-height="665" /></a><figcaption>Rotation of the dwarf planet <a href="/wiki/Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a></figcaption></figure> <p>A <a href="/wiki/Sidereal_time" title="Sidereal time">sidereal day</a> or <a href="/wiki/Stellar_day" class="mw-redirect" title="Stellar day">stellar day</a> is the span of time it takes for the Earth to make one entire <a href="/wiki/Rotation" title="Rotation">rotation</a><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> with respect to the celestial background or a distant star (assumed to be fixed).<sup id="cite_ref-:1_6-0" class="reference"><a href="#cite_note-:1-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Measuring a day as such is used in <a href="/wiki/Astronomy" title="Astronomy">astronomy</a>.<sup id="cite_ref-:1_6-1" class="reference"><a href="#cite_note-:1-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> A sidereal day is about 4 minutes less than a solar day of 24 hours (23 hours 56 minutes and 4.09 seconds), or 0.99726968 of a solar day of 24 hours.<sup id="cite_ref-Allen296_7-0" class="reference"><a href="#cite_note-Allen296-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> There are about 366.2422 stellar days in one mean tropical year (one stellar day more than the number of solar days).<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>Besides a stellar day on <a href="/wiki/Earth" title="Earth">Earth</a>, other bodies in the Solar System have day times, the durations of these being:<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-VRG-20190118_10-0" class="reference"><a href="#cite_note-VRG-20190118-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <tbody><tr> <th>Name </th> <th>Daylength (hours) </th></tr> <tr> <td><a href="/wiki/Mercury_(planet)" title="Mercury (planet)">Mercury</a> </td> <td><span class="nowrap"><span data-sort-value="7003422260000000000♠"></span>4<span style="margin-left:.25em;">222</span>.6</span> </td></tr> <tr> <td><a href="/wiki/Venus" title="Venus">Venus</a> </td> <td><span class="nowrap"><span data-sort-value="7003280200000000000♠"></span>2802</span> </td></tr> <tr> <td><a href="/wiki/Moon" title="Moon">Earth's Moon</a> </td> <td>708.7 </td></tr> <tr> <td><a href="/wiki/Mars" title="Mars">Mars</a> </td> <td>24.7 </td></tr> <tr> <td><a href="/wiki/Ceres_(dwarf_planet)" title="Ceres (dwarf planet)">Ceres</a> </td> <td>9<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>–9.1<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><a href="/wiki/Jupiter" title="Jupiter">Jupiter</a> </td> <td>9.9 </td></tr> <tr> <td><a href="/wiki/Saturn" title="Saturn">Saturn</a> </td> <td>10.7 </td></tr> <tr> <td><a href="/wiki/Uranus" title="Uranus">Uranus</a> </td> <td>17.2 </td></tr> <tr> <td><a href="/wiki/Neptune" title="Neptune">Neptune</a> </td> <td>16.1 </td></tr> <tr> <td><a href="/wiki/Pluto" title="Pluto">Pluto</a> </td> <td>153.3 </td></tr></tbody></table> <div class="mw-heading mw-heading3"><h3 id="In_the_International_System_of_Units">In the International System of Units</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=6" title="Edit section: In the International System of Units"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/International_System_of_Units" title="International System of Units">International System of Units</a></div> <p>In the <a href="/wiki/International_System_of_Units" title="International System of Units">International System of Units</a> (SI), a day <a href="/wiki/Non-SI_units_mentioned_in_the_SI" title="Non-SI units mentioned in the SI">not an official unit, but is accepted for use with SI</a>.<sup id="cite_ref-Non-SI_13-0" class="reference"><a href="#cite_note-Non-SI-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> A day, with symbol d, is defined using SI units as 86,400 seconds; the second is the base unit of time in <a href="/wiki/SI_units" class="mw-redirect" title="SI units">SI units</a>. In 1967–68, during the 13th CGPM (Resolution 1),<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> the <a href="/wiki/International_Bureau_of_Weights_and_Measures" title="International Bureau of Weights and Measures">International Bureau of Weights and Measures</a> (BIPM) redefined a second as "the duration of 9,192,631,770 periods of the <a href="/wiki/Radioactive_decay" title="Radioactive decay">radiation</a> corresponding to the transition between two <a href="/wiki/Hyperfine_structure" title="Hyperfine structure">hyperfine</a> <a href="/wiki/Energy_level" title="Energy level">levels</a> of the <a href="/wiki/Stationary_state" title="Stationary state">ground state</a> of the <a href="/wiki/Caesium" title="Caesium">caesium</a>-133 <a href="/wiki/Atom" title="Atom">atom</a>".<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> This makes the SI-based day last exactly 794,243,384,928,000 of those periods. </p> <div class="mw-heading mw-heading3"><h3 id="In_decimal_and_metric_time">In decimal and metric time</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=7" title="Edit section: In decimal and metric time"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="/wiki/Decimal_time" title="Decimal time">decimal time</a> and <a href="/wiki/Metric_time" title="Metric time">Metric time</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/36/Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg/220px-Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/36/Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg/330px-Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/36/Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg/440px-Decimal_Clock_face_by_Pierre_Daniel_Destigny_1798-1805.jpg 2x" data-file-width="2533" data-file-height="2533" /></a><figcaption>Decimal clock face, made in around the start of the 19th century</figcaption></figure> <p>Various <a href="/wiki/Decimal_time" title="Decimal time">decimal</a> or <a href="/wiki/Metric_time" title="Metric time">metric time</a> proposals have been made, but do not redefine the day, and use the day or <a href="/wiki/Sidereal_day" class="mw-redirect" title="Sidereal day">sidereal day</a> as a base unit. Metric time uses metric prefixes to keep time. It uses the day as the base unit, and smaller units being fractions of a day: a metric hour (<i>deci</i>) is <style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac"><span class="num">1</span>⁄<span class="den">10</span></span> of a day; a metric minute (<i>milli</i>) is <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">1000</span></span> of a day; etc.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Similarly, in decimal time, the length of a day is static to normal time. A day is also split into 10 hours, and 10 days comprise a <i>décade –</i> the equivalent of a week. 3 <i>décades</i> make a month.<sup id="cite_ref-:5_17-0" class="reference"><a href="#cite_note-:5-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page: 35">: 35 </span></sup> Various decimal time proposals which do not redefine the day: Henri de Sarrauton's proposal kept days, and subdivided hours into 100 minutes;<sup id="cite_ref-:5_17-1" class="reference"><a href="#cite_note-:5-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page: 42">: 42 </span></sup> in Mendizábal y Tamborel's proposal, the <a href="/wiki/Sidereal_day" class="mw-redirect" title="Sidereal day">sidereal day</a> was the basic unit, with subdivisions made upon it;<sup id="cite_ref-:5_17-2" class="reference"><a href="#cite_note-:5-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Pages: 42–43">: 42–43 </span></sup> and Rey-Pailhade's proposal divided the day 100 <i>cés.<sup id="cite_ref-:5_17-3" class="reference"><a href="#cite_note-:5-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page: 42">: 42 </span></sup></i> </p> <div class="mw-heading mw-heading3"><h3 id="Other_definitions">Other definitions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=8" title="Edit section: Other definitions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The word refers to various similarly defined ideas, such as: </p> <dl><dt>Full day</dt></dl> <ul><li>24 <a href="/wiki/Hour" title="Hour">hours</a> (exactly) (a <a href="/wiki/Nychthemeron" title="Nychthemeron">nychthemeron</a>)</li> <li>A day counting approximation, for example "See you in three days." or "the following day"</li> <li>The full day covering both the dark and light periods, beginning from the start of the dark period or from a point near the middle of the dark period</li> <li>A full dark and light period, sometimes called a <i><a href="/wiki/Nychthemeron" title="Nychthemeron">nychthemeron</a></i> in English, from the Greek for <i><a href="/wiki/Night" title="Night">night</a>-day</i>;<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> or more colloquially the term <span class="nowrap"><i>24 hours</i></span>. In other languages, <span class="nowrap"><i>24 hours</i></span> is also often used. Other languages also have a separate word for a full day.</li> <li>Part of a date: the day of the year (<i>doy</i>) in <a href="/wiki/Ordinal_date" title="Ordinal date">ordinal dates</a>, day of the month (<i>dom</i>) in <a href="/wiki/Calendar_date" title="Calendar date">calendar dates</a> or <a href="/wiki/Weekday" class="mw-redirect" title="Weekday">day of the week</a> (<i>dow</i>) in <a href="/wiki/Week_date" class="mw-redirect" title="Week date">week dates</a>.</li> <li>Time regularly spend at paid work on a single <a href="/wiki/Work_day" class="mw-redirect" title="Work day">work day</a>, cf. <a href="/wiki/Man-hour" title="Man-hour">man-day</a> and <a href="/wiki/Workweek" class="mw-redirect" title="Workweek">workweek</a>.</li></ul> <dl><dt>Daytime</dt></dl> <ul><li>The period of light when the Sun is above the local <a href="/wiki/Horizon" title="Horizon">horizon</a> (that is, the time period from <a href="/wiki/Sunrise" title="Sunrise">sunrise</a> to <a href="/wiki/Sunset" title="Sunset">sunset</a>)</li> <li>The time period from 06:00–18:00 (6:00 <a href="/wiki/12-hour_clock" title="12-hour clock">am</a> – 6:00 pm) or 21:00 (9:00 pm) or another fixed clock period overlapping or offset from other time periods such as "<a href="/wiki/Morning" title="Morning">morning</a>", "<a href="/wiki/Afternoon" title="Afternoon">afternoon</a>", or "<a href="/wiki/Evening" title="Evening">evening</a>".</li> <li>The time period from first-light "<a href="/wiki/Dawn" title="Dawn">dawn</a>" to last-light "<a href="/wiki/Dusk" title="Dusk">dusk</a>".</li></ul> <dl><dt>Other</dt></dl> <ul><li>A specific period of the day, which may vary by context, such as "the school day" or "the work day".</li></ul> <div class="mw-heading mw-heading2"><h2 id="Variations_in_length">Variations in length</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=9" title="Edit section: Variations in length"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Leap_second" title="Leap second">Leap second</a> and <a href="/wiki/Tidal_acceleration" title="Tidal acceleration">Tidal acceleration</a></div> <p>Mainly due to <a href="/wiki/Tidal_acceleration" title="Tidal acceleration">tidal deceleration</a> – the Moon's <a href="/wiki/Gravity" title="Gravity">gravitational pull</a> slowing down the <a href="/wiki/Earth%27s_rotation" title="Earth's rotation">Earth's rotation</a> – the Earth's <a href="/wiki/Rotation_period" class="mw-redirect" title="Rotation period">rotational period</a> is slowing.<sup id="cite_ref-:4_19-0" class="reference"><a href="#cite_note-:4-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> Because of the way the second is defined, the mean length of a solar day is now about 86,400.002 seconds, and is increasing by about 2 <a href="/wiki/Millisecond" title="Millisecond">milliseconds</a> per century.<sup id="cite_ref-:2_20-0" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p><p>Since the rotation rate of the Earth is slowing, the length of a <abbr title="International System of Units">SI</abbr> second fell out of sync with a second derived from the rotational period.<sup id="cite_ref-:4_19-1" class="reference"><a href="#cite_note-:4-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> This arose the need for <a href="/wiki/Leap_second" title="Leap second">leap seconds</a>, which insert extra seconds into <a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">Coordinated Universal Time (UTC)</a>.<sup id="cite_ref-:4_19-2" class="reference"><a href="#cite_note-:4-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> Although typically 86,400 <abbr title="International System of Units">SI</abbr> seconds in duration, a civil day can be either 86,401 or 86,399 SI seconds long on such a day. Other than the two-millisecond variation from tidal deceleration, <a href="/wiki/Day_length_fluctuations" title="Day length fluctuations">other factors minutely affect the day's length</a>, which creates an irregularity in the placement of leap seconds.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> Leap seconds are announced in advance by the <a href="/wiki/International_Earth_Rotation_and_Reference_Systems_Service" title="International Earth Rotation and Reference Systems Service">International Earth Rotation and Reference Systems Service (IERS)</a>, which measures the Earth's rotation and determines whether a leap second is necessary. </p> <div class="mw-heading mw-heading3"><h3 id="Geological_day_lengths">Geological day lengths</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=10" title="Edit section: Geological day lengths"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Discovered by paleontologist <a href="/wiki/John_W._Wells" title="John W. Wells">John W. Wells</a>, the day lengths of geological periods have been estimated by measuring sedimentation rings in coral <a href="/wiki/Fossil" title="Fossil">fossils</a>,<sup id="cite_ref-:3_22-0" class="reference"><a href="#cite_note-:3-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_20-1" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> due to some biological systems being affected by the tide.<sup id="cite_ref-:2_20-2" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> The length of a day at the Earth's formation is estimated at 6 hours.<sup id="cite_ref-:2_20-3" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> Arbab I. Arbab plotted day lengths over time and found a curved line.<sup id="cite_ref-:2_20-4" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> Arbab attributed this to the change of water volume present affecting Earth's rotation.<sup id="cite_ref-:2_20-5" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable"> <tbody><tr> <td><b>Date</b> </td> <td><b>Geological period</b> </td> <td><b>Number of days per year</b><sup id="cite_ref-:3_22-1" class="reference"><a href="#cite_note-:3-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </td> <td><b>Duration of the day</b> </td></tr> <tr> <td>Present </td> <td>Current </td> <td>365 </td> <td>24 hours </td></tr> <tr> <td>−100 million years </td> <td><a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a> </td> <td>380 </td> <td>23 hours and 20 minutes </td></tr> <tr> <td>−200 million years </td> <td><a href="/wiki/Triassic" title="Triassic">Triassic</a> </td> <td>390 </td> <td>22 hours and 40 minutes </td></tr> <tr> <td>−300 million years </td> <td><a href="/wiki/Carboniferous" title="Carboniferous">Carboniferous</a> </td> <td>400 </td> <td>22 hours </td></tr> <tr> <td>−400 million years </td> <td><a href="/wiki/Devonian" title="Devonian">Devonian</a> </td> <td>410 </td> <td>21 hours and 20 minutes </td></tr> <tr> <td>−500 million years </td> <td><a href="/wiki/Cambrian" title="Cambrian">Cambrian</a> </td> <td>425 </td> <td>20 hours and 40 minutes </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Boundaries">Boundaries</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=11" title="Edit section: Boundaries"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Sun_and_Moon_Nuremberg_chronicle.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/09/Sun_and_Moon_Nuremberg_chronicle.jpg/208px-Sun_and_Moon_Nuremberg_chronicle.jpg" decoding="async" width="208" height="201" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/0/09/Sun_and_Moon_Nuremberg_chronicle.jpg 1.5x" data-file-width="245" data-file-height="237" /></a><figcaption><a href="/wiki/Sun" title="Sun">Sun</a> and <a href="/wiki/Moon" title="Moon">Moon</a>, <a href="/wiki/Hartmann_Schedel" title="Hartmann Schedel">Hartmann Schedel</a>'s <i><a href="/wiki/Nuremberg_Chronicle" title="Nuremberg Chronicle">Nuremberg Chronicle</a></i>, 1493</figcaption></figure><style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed_section plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Day" title="Special:EditPage/Day">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a> in this section. Unsourced material may be challenged and removed.</span> <span class="date-container"><i>(<span class="date">May 2023</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>For most <a href="/wiki/Diurnality" title="Diurnality">diurnal</a> animals, the day naturally begins at dawn and ends at sunset. Humans, with their cultural norms and scientific knowledge, have employed several different conceptions of the day's boundaries. </p><p>In the <a href="/wiki/Hebrew_Bible" title="Hebrew Bible">Hebrew Bible</a>, <a href="/wiki/Book_of_Genesis" title="Book of Genesis">Genesis</a> 1:5 defines a day in terms of "evening" and "morning" before recounting the creation of the Sun to illuminate it: "And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day." The <a href="/wiki/Judaism" title="Judaism">Jewish</a> day begins at either sunset or nightfall (when three second-<a href="/wiki/Magnitude_(astronomy)" title="Magnitude (astronomy)">magnitude</a> stars appear). <a href="/wiki/Middle_Ages" title="Middle Ages">Medieval</a> Europe also followed this tradition, known as <a href="/wiki/Florentine_calendar" title="Florentine calendar">Florentine</a> reckoning: In this system, a reference like "two hours into the day" meant <i>two hours after sunset</i> and thus times during the evening need to be shifted back one calendar day in modern reckoning. Days such as <a href="/wiki/Christmas_Eve" title="Christmas Eve">Christmas Eve</a>, <a href="/wiki/Halloween" title="Halloween">Halloween</a> (“All Hallows’ Eve”), and the Eve of <a href="/wiki/Agnes_of_Rome" title="Agnes of Rome">Saint Agnes</a> are remnants of the older pattern when <a href="/wiki/Holiday#Religious_holidays" title="Holiday">holidays</a> began during the prior evening. </p><p>The common convention among the <a href="/wiki/Ancient_Rome" title="Ancient Rome">ancient Romans</a>,<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Ancient_China" class="mw-redirect" title="Ancient China">ancient Chinese</a><sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> and in modern times is for the civil day to begin at midnight, i.e. 00:00, and to last a full 24 hours until 24:00, i.e. 00:00 of the next day. The <a href="/wiki/International_Meridian_Conference" title="International Meridian Conference">International Meridian Conference</a> of 1884 resolved </p> <blockquote><p>That the Conference expresses the hope that as soon as may be practicable the astronomical and nautical days will be arranged everywhere to begin at midnight.</p></blockquote> <p>In <a href="/wiki/Ancient_Egypt" title="Ancient Egypt">ancient Egypt</a> the day was reckoned from sunrise to sunrise. </p><p>Prior to 1926, Turkey had two time systems: <i>Turkish</i>, counting the hours from sunset, and <i>French</i>, counting the hours from midnight. </p> <div class="mw-heading mw-heading2"><h2 id="Parts">Parts</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=12" title="Edit section: Parts"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Category:Parts_of_a_day" title="Category:Parts of a day">Category:Parts of a day</a></div> <p>Humans have divided the day in rough periods, which can have cultural implications, and other effects on humans' biological processes. The parts of the day do not have set times; they can vary by lifestyle or hours of daylight in a given place.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Daytime">Daytime</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=13" title="Edit section: Daytime"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Daytime" title="Daytime">Daytime</a></div> <p><a href="/wiki/Daytime" title="Daytime">Daytime</a> is the part of the day during which <a href="/wiki/Sunlight" title="Sunlight">sunlight</a> directly reaches the ground, assuming that there are no obstacles. The length of daytime averages slightly more than half of the 24-hour day. Two effects make daytime on average longer than night. The Sun is not a point but has an apparent size of about 32 <a href="/wiki/Minute_of_arc" class="mw-redirect" title="Minute of arc">minutes of arc</a>. Additionally, the <a href="/wiki/Earth%27s_atmosphere" class="mw-redirect" title="Earth's atmosphere">atmosphere</a> <a href="/wiki/Refraction" title="Refraction">refracts</a> sunlight in such a way that some of it reaches the ground even when the Sun is below the horizon by about 34 minutes of arc. So the first light reaches the ground when the centre of the Sun is still below the horizon by about 50 minutes of arc.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> Thus, daytime is on average around 7 minutes longer than 12 hours.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </p><p>Daytime is further divided into <a href="/wiki/Morning" title="Morning">morning</a>, <a href="/wiki/Afternoon" title="Afternoon">afternoon</a>, and <a href="/wiki/Evening" title="Evening">evening</a>. Morning occurs between <a href="/wiki/Sunrise" title="Sunrise">sunrise</a> and <a href="/wiki/Noon" title="Noon">noon</a>.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> Afternoon occurs between noon and <a href="/wiki/Sunset" title="Sunset">sunset</a>,<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> or between noon and the start of evening. This period of time sees human's highest <a href="/wiki/Thermoregulation" title="Thermoregulation">body temperature</a>,<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> an increase of <a href="/wiki/Traffic_collision" title="Traffic collision">traffic collisions</a>,<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> and a decrease of <a href="/wiki/Productivity" title="Productivity">productivity</a>.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> Evening begins around 5 or 6 pm, or when the sun sets, and ends when one goes to bed.<sup id="cite_ref-oed_33-0" class="reference"><a href="#cite_note-oed-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Britannica_34-0" class="reference"><a href="#cite_note-Britannica-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Twilight">Twilight</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=14" title="Edit section: Twilight"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Twilight" title="Twilight">Twilight</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Twilight-dawn_subcategories.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Twilight-dawn_subcategories.svg/220px-Twilight-dawn_subcategories.svg.png" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Twilight-dawn_subcategories.svg/330px-Twilight-dawn_subcategories.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b4/Twilight-dawn_subcategories.svg/440px-Twilight-dawn_subcategories.svg.png 2x" data-file-width="512" data-file-height="343" /></a><figcaption></figcaption></figure> <p><a href="/wiki/Twilight" title="Twilight">Twilight</a> is the period before <a href="/wiki/Sunrise" title="Sunrise">sunrise</a> and after <a href="/wiki/Sunset" title="Sunset">sunset</a> in which there is natural light but no direct sunlight.<sup id="cite_ref-USNO_36-0" class="reference"><a href="#cite_note-USNO-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> The morning twilight begins at <a href="/wiki/Dawn" title="Dawn">dawn</a> and ends at sunrise, while the evening twilight begins at sunset and ends at <a href="/wiki/Dusk" title="Dusk">dusk</a>. Both periods of twilight can be divided into <a href="/wiki/Civil_twilight" class="mw-redirect" title="Civil twilight">civil twilight</a>, <a href="/wiki/Nautical_twilight" class="mw-redirect" title="Nautical twilight">nautical twilight</a>, and <a href="/wiki/Astronomical_twilight" class="mw-redirect" title="Astronomical twilight">astronomical twilight</a>. Civil twilight is when the sun is up to 6 degrees below the horizon; nautical when it is up to 12 degrees below, and astronomical when it is up to 18 degrees below.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg/220px-Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg" decoding="async" width="220" height="144" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg/330px-Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg/440px-Adolf_Stademann_Flusslandschaft_im_Mondschein.jpg 2x" data-file-width="1300" data-file-height="852" /></a><figcaption><a href="/wiki/Night_in_paintings_(Western_art)" title="Night in paintings (Western art)">Night in art</a></figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="Night">Night</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=15" title="Edit section: Night"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Night" title="Night">Night</a></div> <p><a href="/wiki/Night" title="Night">Night</a> is the period in which the sky is <a href="/wiki/Darkness" title="Darkness">dark</a>;<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> the period between <a href="/wiki/Dusk" title="Dusk">dusk</a> and <a href="/wiki/Dawn" title="Dawn">dawn</a> when no light from the sun is visible.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Light_pollution" title="Light pollution">Light pollution</a> during night can impact human and animal life, for example by disrupting sleep.<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=16" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/Determination_of_the_day_of_the_week" title="Determination of the day of the week">Determination of the day of the week</a></li> <li><a href="/wiki/Holiday" title="Holiday">Holiday</a></li> <li><a href="/wiki/ISO_8601" title="ISO 8601">ISO 8601</a></li> <li><a href="/wiki/Season" title="Season">Season</a>, for a discussion of daylight and darkness at various latitudes</li> <li><a href="/wiki/Synodic_day" title="Synodic day">Synodic day</a></li> <li><a href="/wiki/World_Meteorological_day" class="mw-redirect" title="World Meteorological day">World Meteorological day</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=17" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-:0-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-:0_1-0">^</a></b></span> <span class="reference-text">Mallory, James P.; Adams, Douglas Q. (2006). <i>The Oxford Introduction to Proto-Indo-European and the Proto-Indo-European World</i>. Oxford, UK: Oxford University Press. p. 124. <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-19-929668-2" title="Special:BookSources/978-0-19-929668-2">978-0-19-929668-2</a>.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://hpiers.obspm.fr/eoppc/eop/eopc04/eopc04.62-now">"Earth Orientation Parameters"</a>. International Earth Rotation and Reference Systems Service. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150426160146/http://hpiers.obspm.fr/eoppc/eop/eopc04/eopc04.62-now">Archived</a> from the original on April 26, 2015.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Earth+Orientation+Parameters&rft.pub=International+Earth+Rotation+and+Reference+Systems+Service&rft_id=http%3A%2F%2Fhpiers.obspm.fr%2Feoppc%2Feop%2Feopc04%2Feopc04.62-now&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">L. Holford-Stevens, <i>The History of Time</i> (Oxford 2005) p. 6</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.britannica.com/science/day">"day"</a>. <i><a href="/wiki/Encyclop%C3%A6dia_Britannica" title="Encyclopædia Britannica">Encyclopædia Britannica</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220710214718/https://www.britannica.com/science/day">Archived</a> from the original on 2022-07-10<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Encyclop%C3%A6dia+Britannica&rft.atitle=day&rft_id=https%3A%2F%2Fwww.britannica.com%2Fscience%2Fday&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">Certain authors caution against identifying "day" with rotation period. For example: <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSeligman" class="citation web cs1">Seligman, Courtney. <a rel="nofollow" class="external text" href="http://cseligman.com/text/sky/rotationvsday.htm">"Rotation Period and Day Length"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180929010908/http://cseligman.com/text/sky/rotationvsday.htm">Archived</a> from the original on 2018-09-29<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-06-03</span></span>. <q>A Cautionary Note: Because the rotation period of the Earth is almost the same as the length of its day, we sometimes get a bit sloppy in discussing the rotation of the sky, and say that the stars rotate around us once each day. In a similar way, it is not unusual for careless people to mix up the rotation period of a planet with the length of its day, or vice versa.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Rotation+Period+and+Day+Length&rft.aulast=Seligman&rft.aufirst=Courtney&rft_id=http%3A%2F%2Fcseligman.com%2Ftext%2Fsky%2Frotationvsday.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-:1-6"><span class="mw-cite-backlink">^ <a href="#cite_ref-:1_6-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:1_6-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.britannica.com/science/sidereal-day">"sidereal day"</a>. <i><a href="/wiki/Encyclop%C3%A6dia_Britannica" title="Encyclopædia Britannica">Encyclopædia Britannica</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220926003236/https://www.britannica.com/science/sidereal-day">Archived</a> from the original on 2022-09-26<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Encyclop%C3%A6dia+Britannica&rft.atitle=sidereal+day&rft_id=https%3A%2F%2Fwww.britannica.com%2Fscience%2Fsidereal-day&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-Allen296-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-Allen296_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAllenCox2000" class="citation book cs1"><a href="/wiki/Clabon_Walter_Allen" class="mw-redirect" title="Clabon Walter Allen">Allen, Clabon Walter</a> & Cox, Arthur N. 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Retrieved <span class="nowrap">18 January</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+Verge&rft.atitle=Shaky+rings+help+scientists+measure+Saturn%27s+days+%E2%80%93+Speedy+planet&rft.date=2019-01-18&rft.aulast=Griggs&rft.aufirst=Mary+Beth&rft_id=https%3A%2F%2Fwww.theverge.com%2F2019%2F1%2F18%2F18188429%2Frings-saturn-nasa-day-time-hours-duration&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://solarsystem.nasa.gov/planets/dwarf-planets/ceres/in-depth/">"planets/dwarf-planets/ceres/in-depth"</a>. <i>nasa.gov</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210602235747/https://solarsystem.nasa.gov/planets/dwarf-planets/ceres/in-depth/">Archived</a> from the original on June 2, 2021<span class="reference-accessdate">. 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Retrieved <span class="nowrap">May 30,</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.space.com&rft.atitle=Dwarf+Planets+of+Our+Solar+System+%28Infographic%29&rft.date=2012-11-21&rft.au=Tate%2C+Karl&rft_id=https%3A%2F%2Fwww.space.com%2F18584-dwarf-planets-solar-system-infographic.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-Non-SI-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-Non-SI_13-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBIPM2014" class="citation web cs1"><a href="/wiki/International_Bureau_of_Weights_and_Measures" title="International Bureau of Weights and Measures">BIPM</a> (2014) [2006]. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20141111155820/http://www.bipm.org/en/publications/si-brochure/table6.html">"Non-SI units accepted for use with the SI, and units based on fundamental constants"</a>. <i>SI Brochure</i> (8th ed.). Archived from <a rel="nofollow" class="external text" href="http://www.bipm.org/en/publications/si-brochure/table6.html">the original</a> on 2014-11-11<span class="reference-accessdate">. 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Archived from <a rel="nofollow" class="external text" href="http://www.bipm.org/en/publications/si-brochure/second.html">the original</a> on 2018-06-13<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-10-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=SI+Brochure%3A+The+International+System+of+Units+%28SI%29&rft.atitle=Unit+of+Time+%28Second%29&rft.date=2014&rft_id=http%3A%2F%2Fwww.bipm.org%2Fen%2Fpublications%2Fsi-brochure%2Fsecond.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFVeitch2008" class="citation web cs1">Veitch, Harriet (2008-04-02). <a rel="nofollow" class="external text" href="https://www.smh.com.au/entertainment/books/why-dont-we-have-metric-time-20080402-gds868.html">"Why don't we have metric time?"</a>. <i>The Sydney Morning Herald</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220821154425/https://www.smh.com.au/entertainment/books/why-dont-we-have-metric-time-20080402-gds868.html">Archived</a> from the original on 2022-08-21<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-21</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+Sydney+Morning+Herald&rft.atitle=Why+don%27t+we+have+metric+time%3F&rft.date=2008-04-02&rft.aulast=Veitch&rft.aufirst=Harriet&rft_id=https%3A%2F%2Fwww.smh.com.au%2Fentertainment%2Fbooks%2Fwhy-dont-we-have-metric-time-20080402-gds868.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-:5-17"><span class="mw-cite-backlink">^ <a href="#cite_ref-:5_17-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:5_17-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-:5_17-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-:5_17-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFVera2009" class="citation journal cs1">Vera, Hector (2009). <a rel="nofollow" class="external text" href="https://brill.com/view/journals/kron/9/1-2/article-p29_6.xml">"Decimal Time: Misadventures of a Revolutionary Idea, 1793–2008"</a>. <i>KronoScope</i>. <b>9</b> (1–2): 29–48. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1163%2F156771509X12638154745382">10.1163/156771509X12638154745382</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1567-715X">1567-715X</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220821154425/https://brill.com/view/journals/kron/9/1-2/article-p29_6.xml">Archived</a> from the original on 2022-08-21<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-21</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=KronoScope&rft.atitle=Decimal+Time%3A+Misadventures+of+a+Revolutionary+Idea%2C+1793%E2%80%932008&rft.volume=9&rft.issue=1%E2%80%932&rft.pages=29-48&rft.date=2009&rft_id=info%3Adoi%2F10.1163%2F156771509X12638154745382&rft.issn=1567-715X&rft.aulast=Vera&rft.aufirst=Hector&rft_id=https%3A%2F%2Fbrill.com%2Fview%2Fjournals%2Fkron%2F9%2F1-2%2Farticle-p29_6.xml&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.merriam-webster.com/dictionary/nychthemeron">"Definition of NYCHTHEMERON"</a>. <i>www.merriam-webster.com</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170202145445/https://www.merriam-webster.com/dictionary/nychthemeron">Archived</a> from the original on 2017-02-02<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-02-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.merriam-webster.com&rft.atitle=Definition+of+NYCHTHEMERON&rft_id=https%3A%2F%2Fwww.merriam-webster.com%2Fdictionary%2Fnychthemeron&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-:4-19"><span class="mw-cite-backlink">^ <a href="#cite_ref-:4_19-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:4_19-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-:4_19-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMcCarthyHackmanNelson2008" class="citation journal cs1">McCarthy, Dennis D.; Hackman, Christine; Nelson, Robert A. (2008-11-01). <a rel="nofollow" class="external text" href="https://iopscience.iop.org/article/10.1088/0004-6256/136/5/1906">"The Physical Basis of the Leap Second"</a>. <i>The Astronomical Journal</i>. <b>136</b> (5): 1906–1908. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2008AJ....136.1906M">2008AJ....136.1906M</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1088%2F0004-6256%2F136%2F5%2F1906">10.1088/0004-6256/136/5/1906</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/0004-6256">0004-6256</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:124701789">124701789</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220531162009/https://iopscience.iop.org/article/10.1088/0004-6256/136/5/1906">Archived</a> from the original on 2022-05-31<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-20</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Astronomical+Journal&rft.atitle=The+Physical+Basis+of+the+Leap+Second&rft.volume=136&rft.issue=5&rft.pages=1906-1908&rft.date=2008-11-01&rft_id=info%3Adoi%2F10.1088%2F0004-6256%2F136%2F5%2F1906&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A124701789%23id-name%3DS2CID&rft.issn=0004-6256&rft_id=info%3Abibcode%2F2008AJ....136.1906M&rft.aulast=McCarthy&rft.aufirst=Dennis+D.&rft.au=Hackman%2C+Christine&rft.au=Nelson%2C+Robert+A.&rft_id=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0004-6256%2F136%2F5%2F1906&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-:2-20"><span class="mw-cite-backlink">^ <a href="#cite_ref-:2_20-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:2_20-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-:2_20-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-:2_20-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-:2_20-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-:2_20-5"><sup><i><b>f</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFArbab2009" class="citation journal cs1">Arbab, Arbab I. (January 2009). <a rel="nofollow" class="external text" href="http://www.ptep-online.com/2009/PP-16-02.PDF">"The Length of the Day: A Cosmological Perspective"</a> <span class="cs1-format">(PDF)</span>. <i>Department of Physics, Faculty of Science, University of Khartoum</i>. <b>1</b>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220820051602/http://www.ptep-online.com/2009/PP-16-02.PDF">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2022-08-20<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-20</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Department+of+Physics%2C+Faculty+of+Science%2C+University+of+Khartoum&rft.atitle=The+Length+of+the+Day%3A+A+Cosmological+Perspective&rft.volume=1&rft.date=2009-01&rft.aulast=Arbab&rft.aufirst=Arbab+I.&rft_id=http%3A%2F%2Fwww.ptep-online.com%2F2009%2FPP-16-02.PDF&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.iers.org/IERS/EN/Science/EarthRotation/EarthRotation.html">"IERS science background"</a>. Frankfurt am Main: <a href="/wiki/IERS" class="mw-redirect" title="IERS">IERS</a>. 2013. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160829050135/https://www.iers.org/IERS/EN/Science/EarthRotation/EarthRotation.html">Archived</a> from the original on August 29, 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">August 6,</span> 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=IERS+science+background&rft.place=Frankfurt+am+Main&rft.pub=IERS&rft.date=2013&rft_id=https%3A%2F%2Fwww.iers.org%2FIERS%2FEN%2FScience%2FEarthRotation%2FEarthRotation.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-:3-22"><span class="mw-cite-backlink">^ <a href="#cite_ref-:3_22-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:3_22-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJ.Kovalesky_Bureau_des_Longitudes1969" class="citation journal cs1">J.Kovalesky <i>Bureau des Longitudes</i> (1969). <a rel="nofollow" class="external text" href="http://articles.adsabs.harvard.edu//full/1969LAstr..83..411K/0000411.000.html">"Paléo-Astronomie"</a>. <i>L'Astronomie</i>. <b>83</b>: 411. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1969LAstr..83..411K">1969LAstr..83..411K</a>. <a rel="nofollow" class="external text" href="http://archive.wikiwix.com/cache/20191221210557/http://articles.adsabs.harvard.edu//full/1969LAstr..83..411K/0000411.000.html">Archived</a> from the original on 21 December 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">5 June</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=L%27Astronomie&rft.atitle=Pal%C3%A9o-Astronomie&rft.volume=83&rft.pages=411&rft.date=1969&rft_id=info%3Abibcode%2F1969LAstr..83..411K&rft.au=J.Kovalesky+%27%27Bureau+des+Longitudes%27%27&rft_id=http%3A%2F%2Farticles.adsabs.harvard.edu%2F%2Ffull%2F1969LAstr..83..411K%2F0000411.000.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text">See <a rel="nofollow" class="external text" href="https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A2008.01.0212%3Asection%3D84">Plutarch, <i>Quaestiones Romanae</i>, 84.</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210209025420/http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:2008.01.0212:section%3D84">Archived</a> 2021-02-09 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a></span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><a href="https://en.wikisource.org/wiki/zh:%E6%B8%85%E5%8F%B2%E7%A8%BF/%E5%8D%B748" class="extiw" title="s:zh:清史稿/卷48">s:zh:清史稿/卷48</a>: 起<i>子正</i>，盡<i>夜子初</i>。</span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.britannica.com/dictionary/eb/qa/parts-of-the-day-early-morning-late-morning-etc">"Parts of the Day: Early morning, late morning, etc"</a>. <i>Britannica Dictionary</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220822024715/https://www.britannica.com/dictionary/eb/qa/parts-of-the-day-early-morning-late-morning-etc">Archived</a> from the original on 2022-08-22<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Britannica+Dictionary&rft.atitle=Parts+of+the+Day%3A+Early+morning%2C+late+morning%2C+etc.&rft_id=https%3A%2F%2Fwww.britannica.com%2Fdictionary%2Feb%2Fqa%2Fparts-of-the-day-early-morning-late-morning-etc&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-26"><span class="mw-cite-backlink"><b><a href="#cite_ref-26">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">32′</span>⁄<span class="den">2</span></span> + 34′ = 50′</span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-27">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1214402035">.mw-parser-output .sfrac{white-space:nowrap}.mw-parser-output .sfrac.tion,.mw-parser-output .sfrac .tion{display:inline-block;vertical-align:-0.5em;font-size:85%;text-align:center}.mw-parser-output .sfrac .num{display:block;line-height:1em;margin:0.0em 0.1em;border-bottom:1px solid}.mw-parser-output .sfrac .den{display:block;line-height:1em;margin:0.1em 0.1em}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="sfrac">⁠<span class="tion"><span class="num">50°</span><span class="sr-only">/</span><span class="den">60</span></span>⁠</span> ÷ 360° × 2(for sunrise and set) × 24 hours ≈ 7 min</span> </li> <li id="cite_note-28"><span class="mw-cite-backlink"><b><a href="#cite_ref-28">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.merriam-webster.com/dictionary/morning">"Definition of MORNING"</a>. <i>www.merriam-webster.com</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220822030634/https://www.merriam-webster.com/dictionary/morning">Archived</a> from the original on 2022-08-22<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.merriam-webster.com&rft.atitle=Definition+of+MORNING&rft_id=https%3A%2F%2Fwww.merriam-webster.com%2Fdictionary%2Fmorning&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><b><a href="#cite_ref-29">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.merriam-webster.com/dictionary/afternoon">"Definition of AFTERNOON"</a>. <i>www.merriam-webster.com</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220822030634/https://www.merriam-webster.com/dictionary/afternoon">Archived</a> from the original on 2022-08-22<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.merriam-webster.com&rft.atitle=Definition+of+AFTERNOON&rft_id=https%3A%2F%2Fwww.merriam-webster.com%2Fdictionary%2Fafternoon&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-30"><span class="mw-cite-backlink"><b><a href="#cite_ref-30">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRefinetti2006" class="citation book cs1">Refinetti, Roberto (2006). <i>Circadian Physiology</i> (2nd ed.). Taylor & Francis Group. p. 556. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-8493-2233-4" title="Special:BookSources/978-0-8493-2233-4"><bdi>978-0-8493-2233-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Circadian+Physiology&rft.pages=556&rft.edition=2nd&rft.pub=Taylor+%26+Francis+Group&rft.date=2006&rft.isbn=978-0-8493-2233-4&rft.aulast=Refinetti&rft.aufirst=Roberto&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-31"><span class="mw-cite-backlink"><b><a href="#cite_ref-31">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMcCabe2004" class="citation book cs1">McCabe, Paul T. (2004). <i>Contemporary Ergonomics</i>. CRC Press. p. 588. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-8493-2342-8" title="Special:BookSources/0-8493-2342-8"><bdi>0-8493-2342-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Contemporary+Ergonomics&rft.pages=588&rft.pub=CRC+Press&rft.date=2004&rft.isbn=0-8493-2342-8&rft.aulast=McCabe&rft.aufirst=Paul+T.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-32"><span class="mw-cite-backlink"><b><a href="#cite_ref-32">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRay1960" class="citation book cs1">Ray, James T. (1960). <i>Human Performance as a Function of the Work–Rest Cycle</i>. <a href="/wiki/National_Academy_of_Sciences" title="National Academy of Sciences">National Academy of Sciences</a>. p. 11.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Human+Performance+as+a+Function+of+the+Work%E2%80%93Rest+Cycle&rft.pages=11&rft.pub=National+Academy+of+Sciences&rft.date=1960&rft.aulast=Ray&rft.aufirst=James+T.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-oed-33"><span class="mw-cite-backlink"><b><a href="#cite_ref-oed_33-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.oed.com/dictionary/evening_n1">"evening, n."</a> <i>www.oed.com</i>. Oxford English Dictionary<span class="reference-accessdate">. Retrieved <span class="nowrap">18 September</span> 2023</span>. <q>The close of day, esp. the time from about 6 p.m., or sunset if earlier, to bedtime; the period between afternoon and night.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.oed.com&rft.atitle=evening%2C+n.&rft_id=https%3A%2F%2Fwww.oed.com%2Fdictionary%2Fevening_n1&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-Britannica-34"><span class="mw-cite-backlink"><b><a href="#cite_ref-Britannica_34-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.britannica.com/dictionary/eb/qa/parts-of-the-day-early-morning-late-morning-etc">"Definition of evening in English"</a>. <i>Britannica</i>. <a href="/wiki/Britannica" class="mw-redirect" title="Britannica">Britannica</a><span class="reference-accessdate">. Retrieved <span class="nowrap">17 Sep</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Britannica&rft.atitle=Definition+of+evening+in+English&rft_id=https%3A%2F%2Fwww.britannica.com%2Fdictionary%2Feb%2Fqa%2Fparts-of-the-day-early-morning-late-morning-etc&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-35"><span class="mw-cite-backlink"><b><a href="#cite_ref-35">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.collinsdictionary.com/dictionary/english/evening">"Definition of 'evening'<span class="cs1-kern-right"></span>"</a>. <i><a href="/wiki/Collins_Dictionary" class="mw-redirect" title="Collins Dictionary">Collins Dictionary</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210501040345/https://www.collinsdictionary.com/dictionary/english/evening">Archived</a> from the original on 2021-05-01<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Collins+Dictionary&rft.atitle=Definition+of+%27evening%27&rft_id=https%3A%2F%2Fwww.collinsdictionary.com%2Fdictionary%2Fenglish%2Fevening&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-USNO-36"><span class="mw-cite-backlink"><b><a href="#cite_ref-USNO_36-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20190927072432/http://aa.usno.navy.mil/faq/docs/RST_defs.php">"Definitions from the US Astronomical Applications Dept"</a>. <a href="/wiki/United_States_Naval_Observatory" title="United States Naval Observatory">USNO</a>. Archived from <a rel="nofollow" class="external text" href="http://aa.usno.navy.mil/faq/docs/RST_defs.php">the original</a> on 2019-09-27<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-07-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Definitions+from+the+US+Astronomical+Applications+Dept&rft.pub=USNO&rft_id=http%3A%2F%2Faa.usno.navy.mil%2Ffaq%2Fdocs%2FRST_defs.php&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-37"><span class="mw-cite-backlink"><b><a href="#cite_ref-37">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20170829062838/http://msi.nga.mil:80/MSISiteContent/StaticFiles/NAV_PUBS/APN/Gloss-1.pdf">"Glossary of Marine Navigation"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="http://msi.nga.mil:80/MSISiteContent/StaticFiles/NAV_PUBS/APN/Gloss-1.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-08-29.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Glossary+of+Marine+Navigation&rft_id=http%3A%2F%2Fmsi.nga.mil%3A80%2FMSISiteContent%2FStaticFiles%2FNAV_PUBS%2FAPN%2FGloss-1.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><b><a href="#cite_ref-38">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://dictionary.cambridge.org/dictionary/english/night">"night"</a>. <i><a href="/wiki/Cambridge_Dictionary" class="mw-redirect" title="Cambridge Dictionary">Cambridge Dictionary</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220401194705/https://dictionary.cambridge.org/dictionary/english/night">Archived</a> from the original on 2022-04-01<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Cambridge+Dictionary&rft.atitle=night&rft_id=https%3A%2F%2Fdictionary.cambridge.org%2Fdictionary%2Fenglish%2Fnight&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-39"><span class="mw-cite-backlink"><b><a href="#cite_ref-39">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.merriam-webster.com/dictionary/night">"Definition of NIGHT"</a>. <i>www.merriam-webster.com</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20220822024714/https://www.merriam-webster.com/dictionary/night">Archived</a> from the original on 2022-08-22<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-08-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.merriam-webster.com&rft.atitle=Definition+of+NIGHT&rft_id=https%3A%2F%2Fwww.merriam-webster.com%2Fdictionary%2Fnight&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-40"><span class="mw-cite-backlink"><b><a href="#cite_ref-40">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBlumeGarbazzaSpitschan2019" class="citation journal cs1">Blume, Christine; Garbazza, Corrado; Spitschan, Manuel (2019). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6751071">"Effects of light on human circadian rhythms, sleep and mood"</a>. <i>Somnologie</i>. <b>23</b> (3): 147–156. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1007%2Fs11818-019-00215-x">10.1007/s11818-019-00215-x</a></span>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1432-9123">1432-9123</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6751071">6751071</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/31534436">31534436</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Somnologie&rft.atitle=Effects+of+light+on+human+circadian+rhythms%2C+sleep+and+mood&rft.volume=23&rft.issue=3&rft.pages=147-156&rft.date=2019&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6751071%23id-name%3DPMC&rft.issn=1432-9123&rft_id=info%3Apmid%2F31534436&rft_id=info%3Adoi%2F10.1007%2Fs11818-019-00215-x&rft.aulast=Blume&rft.aufirst=Christine&rft.au=Garbazza%2C+Corrado&rft.au=Spitschan%2C+Manuel&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6751071&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> <li id="cite_note-41"><span class="mw-cite-backlink"><b><a href="#cite_ref-41">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://darksky.org/resources/what-is-light-pollution/effects/wildlife-ecosystems">"Light pollution harms wildlife and ecosystems"</a>. <i>DarkSky International</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-10-30</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=DarkSky+International&rft.atitle=Light+pollution+harms+wildlife+and+ecosystems&rft_id=https%3A%2F%2Fdarksky.org%2Fresources%2Fwhat-is-light-pollution%2Feffects%2Fwildlife-ecosystems&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADay" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Day&action=edit&section=18" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Commons-logo.svg" class="mw-file-description"><img alt="" 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.navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Time_topics" title="Template:Time topics"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Time_topics" title="Template talk:Time topics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Time_topics" title="Special:EditPage/Template:Time topics"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Time" style="font-size:114%;margin:0 4em"><a href="/wiki/Time" title="Time">Time</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Key concepts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Past" title="Past">Past</a></li> <li><a href="/wiki/Present" title="Present">Present</a></li> <li><a href="/wiki/Future" title="Future">Future</a></li> <li><a href="/wiki/Eternity" title="Eternity">Eternity</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Horology" class="mw-redirect" title="Horology">Measurement</a><br />and <a href="/wiki/Time_standard" title="Time standard">standards</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;"><a href="/wiki/Chronometry" title="Chronometry">Chronometry</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">UTC</a></li> <li><a href="/wiki/Universal_Time" title="Universal Time">UT</a></li> <li><a href="/wiki/International_Atomic_Time" title="International Atomic Time">TAI</a></li> <li><a href="/wiki/Unit_of_time" title="Unit of time">Unit of time</a></li> <li><a href="/wiki/Orders_of_magnitude_(time)" title="Orders of magnitude (time)">Orders of magnitude (time)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;"><a href="/wiki/System_of_measurement" class="mw-redirect" title="System of measurement">Measurement<br />systems</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Italian_six-hour_clock" title="Italian six-hour clock">Italian six-hour clock</a></li> <li><a href="/wiki/Thai_six-hour_clock" title="Thai six-hour clock">Thai six-hour clock</a></li> <li><a href="/wiki/12-hour_clock" title="12-hour clock">12-hour clock</a></li> <li><a href="/wiki/24-hour_clock" title="24-hour clock">24-hour clock</a></li> <li><a href="/wiki/Relative_hour" title="Relative hour">Relative hour</a></li> <li><a href="/wiki/Daylight_saving_time" title="Daylight saving time">Daylight saving time</a></li> <li><a href="/wiki/Traditional_Chinese_timekeeping" title="Traditional Chinese timekeeping">Chinese</a></li> <li><a href="/wiki/Decimal_time" title="Decimal time">Decimal</a></li> <li><a href="/wiki/Hexadecimal_time" title="Hexadecimal time">Hexadecimal</a></li> <li><a href="/wiki/Hindu_units_of_time" title="Hindu units of time">Hindu</a></li> <li><a href="/wiki/Metric_time" title="Metric time">Metric</a></li> <li><a href="/wiki/Roman_timekeeping" title="Roman timekeeping">Roman</a></li> <li><a href="/wiki/Sidereal_time" title="Sidereal time">Sidereal</a></li> <li><a href="/wiki/Solar_time" title="Solar time">Solar</a></li> <li><a href="/wiki/Time_zone" title="Time zone">Time zone</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;"><a href="/wiki/Calendar" title="Calendar">Calendars</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Calendar#Systems" title="Calendar">Main types</a> <ul><li><a href="/wiki/Solar_calendar" title="Solar calendar">Solar</a></li> <li><a href="/wiki/Lunar_calendar" title="Lunar calendar">Lunar</a></li> <li><a href="/wiki/Lunisolar_calendar" title="Lunisolar calendar">Lunisolar</a></li></ul></li> <li><a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian</a></li> <li><a href="/wiki/Julian_calendar" title="Julian calendar">Julian</a></li> <li><a href="/wiki/Hebrew_calendar" title="Hebrew calendar">Hebrew</a></li> <li><a href="/wiki/Islamic_calendar" title="Islamic calendar">Islamic</a></li> <li><a href="/wiki/Solar_Hijri_calendar" title="Solar Hijri calendar">Solar Hijri</a></li> <li><a href="/wiki/Chinese_calendar" title="Chinese calendar">Chinese</a></li> <li><a href="/wiki/Hindu_calendar" title="Hindu calendar">Hindu Panchang</a></li> <li><a href="/wiki/Maya_calendar" title="Maya calendar">Maya</a></li> <li><i><a href="/wiki/List_of_calendars" title="List of calendars">List</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;"><a href="/wiki/Clock" title="Clock">Clocks</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clock#Types" title="Clock">Main types</a> <ul><li><a href="/wiki/Astronomical_clock" title="Astronomical clock">astronomical</a> <ul><li><a href="/wiki/Astrarium" title="Astrarium">astrarium</a></li></ul></li> <li><a href="/wiki/Atomic_clock" title="Atomic clock">atomic</a> <ul><li><a href="/wiki/Quantum_clock" class="mw-redirect" title="Quantum clock">quantum</a></li></ul></li> <li><a href="/wiki/Hourglass" title="Hourglass">hourglass</a></li> <li><a href="/wiki/Marine_chronometer" title="Marine chronometer">marine</a></li> <li><a href="/wiki/Sundial" title="Sundial">sundial</a></li> <li><a href="/wiki/Watch" title="Watch">watch</a> <ul><li><a href="/wiki/Mechanical_watch" title="Mechanical watch">mechanical</a></li> <li><a href="/wiki/Stopwatch" title="Stopwatch">stopwatch</a></li></ul></li> <li><a href="/wiki/Water_clock" title="Water clock">water-based</a></li></ul></li> <li><a href="/wiki/Cuckoo_clock" title="Cuckoo clock">Cuckoo clock</a></li> <li><a href="/wiki/Digital_clock" title="Digital clock">Digital clock</a></li> <li><a href="/wiki/Grandfather_clock" title="Grandfather clock">Grandfather clock</a></li> <li><i><a href="/wiki/History_of_timekeeping_devices" title="History of timekeeping devices">History</a></i> <ul><li><i><a href="/wiki/Timeline_of_time_measurement_inventions" title="Timeline of time measurement inventions">Timeline</a></i></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><div class="hlist"><ul><li><a href="/wiki/Chronology" title="Chronology">Chronology</a></li><li><a href="/wiki/History" title="History">History</a></li></ul></div></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astronomical_chronology" title="Astronomical chronology">Astronomical chronology</a></li> <li><a href="/wiki/Big_History" title="Big History">Big History</a></li> <li><a href="/wiki/Calendar_era" title="Calendar era">Calendar era</a></li> <li><a href="/wiki/Deep_time" title="Deep time">Deep time</a></li> <li><a href="/wiki/Periodization" title="Periodization">Periodization</a></li> <li><a href="/wiki/Regnal_year" title="Regnal year">Regnal year</a></li> <li><a href="/wiki/Timeline" title="Timeline">Timeline</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Philosophy_of_space_and_time" title="Philosophy of space and time">Philosophy of time</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/A_series_and_B_series" title="A series and B series">A series and B series</a></li> <li><a href="/wiki/B-theory_of_time" title="B-theory of time">B-theory of time</a></li> <li><a href="/wiki/Chronocentrism" title="Chronocentrism">Chronocentrism</a></li> <li><a href="/wiki/Duration_(philosophy)" title="Duration (philosophy)">Duration</a></li> <li><a href="/wiki/Endurantism" title="Endurantism">Endurantism</a></li> <li><a href="/wiki/Eternal_return" title="Eternal return">Eternal return</a></li> <li><a href="/wiki/Eternalism_(philosophy_of_time)" title="Eternalism (philosophy of time)">Eternalism</a></li> <li><a href="/wiki/Event_(philosophy)" title="Event (philosophy)">Event</a></li> <li><a href="/wiki/Perdurantism" title="Perdurantism">Perdurantism</a></li> <li><a href="/wiki/Philosophical_presentism" title="Philosophical presentism">Presentism</a></li> <li><a href="/wiki/Temporal_finitism" title="Temporal finitism">Temporal finitism</a></li> <li><a href="/wiki/Temporal_parts" title="Temporal parts">Temporal parts</a></li> <li><i><a href="/wiki/The_Unreality_of_Time" title="The Unreality of Time">The Unreality of Time</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><div class="hlist"><ul><li><a href="/wiki/Category:Time_in_religion" title="Category:Time in religion">Religion</a></li><li><a href="/wiki/Template:Time_in_religion_and_mythology" title="Template:Time in religion and mythology">Mythology</a></li></ul></div></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ages_of_Man" title="Ages of Man">Ages of Man</a></li> <li><a href="/wiki/Destiny" title="Destiny">Destiny</a></li> <li><a href="/wiki/Immortality" title="Immortality">Immortality</a></li> <li><a href="/wiki/The_Dreaming" title="The Dreaming">Dreamtime</a></li> <li><a href="/wiki/K%C4%81la" title="Kāla">Kāla</a></li> <li><a href="/wiki/Time_and_fate_deities" title="Time and fate deities">Time and fate deities</a> <ul><li><a href="/wiki/Father_Time" title="Father Time">Father Time</a></li></ul></li> <li><a href="/wiki/Wheel_of_time" title="Wheel of time">Wheel of time</a> <ul><li><a href="/wiki/Kalachakra" title="Kalachakra">Kalachakra</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Time_perception" title="Time perception">Human experience</a><br />and <a href="/wiki/Time-use_research" title="Time-use research">use of time</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chronemics" title="Chronemics">Chronemics</a></li> <li><a href="/wiki/Generation_time" title="Generation time">Generation time</a></li> <li><a href="/wiki/Mental_chronometry" title="Mental chronometry">Mental chronometry</a></li> <li><a href="/wiki/Duration_(music)" title="Duration (music)">Music</a> <ul><li><a href="/wiki/Tempo" title="Tempo">tempo</a></li> <li><a href="/wiki/Time_signature" title="Time signature">time signature</a></li></ul></li> <li><a href="/wiki/Rosy_retrospection" title="Rosy retrospection">Rosy retrospection</a></li> <li><a href="/wiki/Tense%E2%80%93aspect%E2%80%93mood" title="Tense–aspect–mood">Tense–aspect–mood</a></li> <li><a href="/wiki/Time_management" title="Time management">Time management</a></li> <li><a href="/wiki/Yesterday_(time)" title="Yesterday (time)">Yesterday</a> – <a href="/wiki/Present" title="Present">Today</a> – <a href="/wiki/Tomorrow_(time)" title="Tomorrow (time)">Tomorrow</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Time in <a href="/wiki/Science" title="Science">science</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;"><a href="/wiki/Geology" title="Geology">Geology</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Geologic_time_scale" title="Geologic time scale">Geological time</a> <ul><li><a href="/wiki/Age_(geology)" class="mw-redirect" title="Age (geology)">age</a></li> <li><a href="/wiki/Chronozone" title="Chronozone">chron</a></li> <li><a href="/wiki/Eon_(geology)" class="mw-redirect" title="Eon (geology)">eon</a></li> <li><a href="/wiki/Epoch_(geology)" class="mw-redirect" title="Epoch (geology)">epoch</a></li> <li><a href="/wiki/Era_(geology)" class="mw-redirect" title="Era (geology)">era</a></li> <li><a href="/wiki/Geological_period" class="mw-redirect" title="Geological period">period</a></li></ul></li> <li><a href="/wiki/Geochronology" title="Geochronology">Geochronology</a></li> <li><a href="/wiki/Geological_history_of_Earth" title="Geological history of Earth">Geological history of Earth</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;"><a href="/wiki/Time_in_physics" title="Time in physics">Physics</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Absolute_space_and_time" title="Absolute space and time">Absolute space and time</a></li> <li><a href="/wiki/Arrow_of_time" title="Arrow of time">Arrow of time</a></li> <li><a href="/wiki/Chronon" title="Chronon">Chronon</a></li> <li><a href="/wiki/Coordinate_time" title="Coordinate time">Coordinate time</a></li> <li><a href="/wiki/Instant" title="Instant">Instant</a></li> <li><a href="/wiki/Proper_time" title="Proper time">Proper time</a></li> <li><a href="/wiki/Spacetime" title="Spacetime">Spacetime</a></li> <li><a href="/wiki/Theory_of_relativity" title="Theory of relativity">Theory of relativity</a></li> <li><a href="/wiki/Time_domain" title="Time domain">Time domain</a></li> <li><a href="/wiki/Time_translation_symmetry" class="mw-redirect" title="Time translation symmetry">Time translation symmetry</a></li> <li><a href="/wiki/T-symmetry" title="T-symmetry">Time reversal symmetry</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:6.5em;font-weight:normal; text-align:center;">Other fields</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chronological_dating" title="Chronological dating">Chronological dating</a></li> <li><a href="/wiki/Chronobiology" title="Chronobiology">Chronobiology</a> <ul><li><a href="/wiki/Circadian_rhythm" title="Circadian rhythm">Circadian rhythms</a></li></ul></li> <li><a href="/wiki/Chemical_clock" title="Chemical clock">Clock reaction</a></li> <li><a href="/wiki/Glottochronology" title="Glottochronology">Glottochronology</a></li> <li><a href="/wiki/Time_geography" title="Time geography">Time geography</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Leap_year" title="Leap year">Leap year</a></li> <li><a href="/wiki/Memory" title="Memory">Memory</a></li> <li><a href="/wiki/Moment_(unit)" title="Moment (unit)">Moment</a></li> <li><a href="/wiki/Space" title="Space">Space</a></li> <li><a href="/wiki/System_time" title="System time">System time</a></li> <li><i><a href="/wiki/Tempus_fugit" title="Tempus fugit">Tempus fugit</a></i></li> <li><a href="/wiki/Time_capsule" title="Time capsule">Time capsule</a></li> <li><a href="/wiki/Time_immemorial" title="Time immemorial">Time immemorial</a></li> <li><a href="/wiki/Time_travel" title="Time travel">Time travel</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Time" title="Category:Time">Category</a></li> <li><span class="noviewer" typeof="mw:File"><span title="Commons page"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span> <a href="https://commons.wikimedia.org/wiki/Category:Time" class="extiw" title="commons:Category:Time">Commons</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Time_measurement_and_standards" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Time_measurement_and_standards" title="Template:Time measurement and standards"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Time_measurement_and_standards" title="Template talk:Time measurement and standards"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Time_measurement_and_standards" title="Special:EditPage/Template:Time measurement and standards"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Time_measurement_and_standards" style="font-size:114%;margin:0 4em"><a href="/wiki/Time" title="Time">Time measurement</a> and <a href="/wiki/Time_standard" title="Time standard">standards</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><a href="/wiki/Chronometry" title="Chronometry">Chronometry</a></li> <li><a href="/wiki/Orders_of_magnitude_(time)" title="Orders of magnitude (time)">Orders of magnitude</a></li> <li><a href="/wiki/Time_metrology" class="mw-redirect" title="Time metrology">Metrology</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">International standards</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">Coordinated Universal Time</a> <ul><li><a href="/wiki/UTC_offset" title="UTC offset">offset</a></li></ul></li> <li><a href="/wiki/Universal_Time" title="Universal Time">UT</a></li> <li><a href="/wiki/%CE%94T_(timekeeping)" title="ΔT (timekeeping)">ΔT</a></li> <li><a href="/wiki/DUT1" title="DUT1">DUT1</a></li> <li><a href="/wiki/International_Earth_Rotation_and_Reference_Systems_Service" title="International Earth Rotation and Reference Systems Service">International Earth Rotation and Reference Systems Service</a></li> <li><a href="/wiki/ISO_31-1" title="ISO 31-1">ISO 31-1</a></li> <li><a href="/wiki/ISO_8601" title="ISO 8601">ISO 8601</a></li> <li><a href="/wiki/International_Atomic_Time" title="International Atomic Time">International Atomic Time</a></li> <li><a href="/wiki/12-hour_clock" title="12-hour clock">12-hour clock</a></li> <li><a href="/wiki/24-hour_clock" title="24-hour clock">24-hour clock</a></li> <li><a href="/wiki/Barycentric_Coordinate_Time" title="Barycentric Coordinate Time">Barycentric Coordinate Time</a></li> <li><a href="/wiki/Barycentric_Dynamical_Time" title="Barycentric Dynamical Time">Barycentric Dynamical Time</a></li> <li><a href="/wiki/Civil_time" title="Civil time">Civil time</a></li> <li><a href="/wiki/Daylight_saving_time" title="Daylight saving time">Daylight saving time</a></li> <li><a href="/wiki/Geocentric_Coordinate_Time" title="Geocentric Coordinate Time">Geocentric Coordinate Time</a></li> <li><a href="/wiki/International_Date_Line" title="International Date Line">International Date Line</a></li> <li><a href="/wiki/IERS_Reference_Meridian" title="IERS Reference Meridian">IERS Reference Meridian</a></li> <li><a href="/wiki/Leap_second" title="Leap second">Leap second</a></li> <li><a href="/wiki/Solar_time" title="Solar time">Solar time</a></li> <li><a href="/wiki/Terrestrial_Time" title="Terrestrial Time">Terrestrial Time</a></li> <li><a href="/wiki/Time_zone" title="Time zone">Time zone</a></li> <li><a href="/wiki/180th_meridian" title="180th meridian">180th meridian</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/Hourglass" title="Hourglass"><img alt="template illustration" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Marine_sandglass_MMM.jpg/75px-Marine_sandglass_MMM.jpg" decoding="async" width="75" height="175" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Marine_sandglass_MMM.jpg/113px-Marine_sandglass_MMM.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Marine_sandglass_MMM.jpg/150px-Marine_sandglass_MMM.jpg 2x" data-file-width="1637" data-file-height="3819" /></a></span><br /><span typeof="mw:File"><a href="/wiki/Time_zone" title="Time zone"><img alt="template illustration" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png/75px-Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png" decoding="async" width="75" height="152" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png/113px-Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png/150px-Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png 2x" data-file-width="496" data-file-height="1007" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Obsolete standards</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ephemeris_time" title="Ephemeris time">Ephemeris time</a></li> <li><a href="/wiki/Greenwich_Mean_Time" title="Greenwich Mean Time">Greenwich Mean Time</a></li> <li><a href="/wiki/Prime_meridian" title="Prime meridian">Prime meridian</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Time_in_physics" title="Time in physics">Time in physics</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Absolute_space_and_time" title="Absolute space and time">Absolute space and time</a></li> <li><a href="/wiki/Spacetime" title="Spacetime">Spacetime</a></li> <li><a href="/wiki/Chronon" title="Chronon">Chronon</a></li> <li><a href="/wiki/Continuous_signal" class="mw-redirect" title="Continuous signal">Continuous signal</a></li> <li><a href="/wiki/Coordinate_time" title="Coordinate time">Coordinate time</a></li> <li><a href="/wiki/Cosmological_decade" title="Cosmological decade">Cosmological decade</a></li> <li><a href="/wiki/Discrete_time_and_continuous_time" title="Discrete time and continuous time">Discrete time and continuous time</a></li> <li><a href="/wiki/Proper_time" title="Proper time">Proper time</a></li> <li><a href="/wiki/Theory_of_relativity" title="Theory of relativity">Theory of relativity</a></li> <li><a href="/wiki/Time_dilation" title="Time dilation">Time dilation</a></li> <li><a href="/wiki/Gravitational_time_dilation" title="Gravitational time dilation">Gravitational time dilation</a></li> <li><a href="/wiki/Time_domain" title="Time domain">Time domain</a></li> <li><a href="/wiki/Time-translation_symmetry" title="Time-translation symmetry">Time-translation symmetry</a></li> <li><a href="/wiki/T-symmetry" title="T-symmetry">T-symmetry</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Horology" class="mw-redirect" title="Horology">Horology</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clock" title="Clock">Clock</a></li> <li><a href="/wiki/Astrarium" title="Astrarium">Astrarium</a></li> <li><a href="/wiki/Atomic_clock" title="Atomic clock">Atomic clock</a></li> <li><a href="/wiki/Complication_(horology)" title="Complication (horology)">Complication</a></li> <li><a href="/wiki/History_of_timekeeping_devices" title="History of timekeeping devices">History of timekeeping devices</a></li> <li><a href="/wiki/Hourglass" title="Hourglass">Hourglass</a></li> <li><a href="/wiki/Marine_chronometer" title="Marine chronometer">Marine chronometer</a></li> <li><a href="/wiki/Marine_sandglass" title="Marine sandglass">Marine sandglass</a></li> <li><a href="/wiki/Radio_clock" title="Radio clock">Radio clock</a></li> <li><a href="/wiki/Watch" title="Watch">Watch</a> <ul><li><a href="/wiki/Stopwatch" title="Stopwatch">stopwatch</a></li></ul></li> <li><a href="/wiki/Water_clock" title="Water clock">Water clock</a></li> <li><a href="/wiki/Sundial" title="Sundial">Sundial</a></li> <li><a href="/wiki/Dialing_scales" title="Dialing scales">Dialing scales</a></li> <li><a href="/wiki/Equation_of_time" title="Equation of time">Equation of time</a></li> <li><a href="/wiki/History_of_sundials" title="History of sundials">History of sundials</a></li> <li><a href="/wiki/Schema_for_horizontal_dials" title="Schema for horizontal dials">Sundial markup schema</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Calendar" title="Calendar">Calendar</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian</a></li> <li><a href="/wiki/Hebrew_calendar" title="Hebrew calendar">Hebrew</a></li> <li><a href="/wiki/Hindu_calendar" title="Hindu calendar">Hindu</a></li> <li><a href="/wiki/Holocene_calendar" title="Holocene calendar">Holocene</a></li> <li><a href="/wiki/Islamic_calendar" title="Islamic calendar">Islamic</a> (lunar Hijri)</li> <li><a href="/wiki/Julian_calendar" title="Julian calendar">Julian</a></li> <li><a href="/wiki/Solar_Hijri_calendar" title="Solar Hijri calendar">Solar Hijri</a></li> <li><a href="/wiki/Astronomical_year_numbering" title="Astronomical year numbering">Astronomical</a></li> <li><a href="/wiki/Dominical_letter" title="Dominical letter">Dominical letter</a></li> <li><a href="/wiki/Epact" title="Epact">Epact</a></li> <li><a href="/wiki/Equinox" title="Equinox">Equinox</a></li> <li><a href="/wiki/Intercalation_(timekeeping)" title="Intercalation (timekeeping)">Intercalation</a></li> <li><a href="/wiki/Julian_day" title="Julian day">Julian day</a></li> <li><a href="/wiki/Leap_year" title="Leap year">Leap year</a></li> <li><a href="/wiki/Lunar_calendar" title="Lunar calendar">Lunar</a></li> <li><a href="/wiki/Lunisolar_calendar" title="Lunisolar calendar">Lunisolar</a></li> <li><a href="/wiki/Solar_calendar" title="Solar calendar">Solar</a></li> <li><a href="/wiki/Solstice" title="Solstice">Solstice</a></li> <li><a href="/wiki/Tropical_year" title="Tropical year">Tropical year</a></li> <li><a href="/wiki/Determination_of_the_day_of_the_week" title="Determination of the day of the week">Weekday determination</a></li> <li><a href="/wiki/Names_of_the_days_of_the_week" title="Names of the days of the week">Weekday names</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Archaeology and geology</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chronological_dating" title="Chronological dating">Chronological dating</a></li> <li><a href="/wiki/Geologic_time_scale" title="Geologic time scale">Geologic time scale</a></li> <li><a href="/wiki/International_Commission_on_Stratigraphy" title="International Commission on Stratigraphy">International Commission on Stratigraphy</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Astronomical_chronology" title="Astronomical chronology">Astronomical chronology</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Galactic_year" title="Galactic year">Galactic year</a></li> <li><a href="/wiki/Nuclear_timescale" title="Nuclear timescale">Nuclear timescale</a></li> <li><a href="/wiki/Precession" title="Precession">Precession</a></li> <li><a href="/wiki/Sidereal_time" title="Sidereal time">Sidereal time</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other <a href="/wiki/Unit_of_time" title="Unit of time">units of time</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Instant" title="Instant">Instant</a></li> <li><a href="/wiki/Flick_(time)" title="Flick (time)">Flick</a></li> <li><a href="/wiki/Shake_(unit)" title="Shake (unit)">Shake</a></li> <li><a href="/wiki/Jiffy_(time)" title="Jiffy (time)">Jiffy</a></li> <li><a href="/wiki/Second" title="Second">Second</a></li> <li><a href="/wiki/Minute" title="Minute">Minute</a></li> <li><a href="/wiki/Moment_(unit)" title="Moment (unit)">Moment</a></li> <li><a href="/wiki/Hour" title="Hour">Hour</a></li> <li><a class="mw-selflink selflink">Day</a></li> <li><a href="/wiki/Week" title="Week">Week</a></li> <li><a href="/wiki/Fortnight" title="Fortnight">Fortnight</a></li> <li><a href="/wiki/Month" title="Month">Month</a></li> <li><a href="/wiki/Year" title="Year">Year</a></li> <li><a href="/wiki/Olympiad" title="Olympiad">Olympiad</a></li> <li><a href="/wiki/Lustrum" title="Lustrum">Lustrum</a></li> <li><a href="/wiki/Decade" title="Decade">Decade</a></li> <li><a href="/wiki/Century" title="Century">Century</a></li> <li><a href="/wiki/Saeculum" title="Saeculum">Saeculum</a></li> <li><a href="/wiki/Millennium" title="Millennium">Millennium</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related topics</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chronology" title="Chronology">Chronology</a></li> <li><a href="/wiki/Duration_(philosophy)" title="Duration (philosophy)">Duration</a> <ul><li><a href="/wiki/Duration_(music)" title="Duration (music)">music</a></li></ul></li> <li><a href="/wiki/Mental_chronometry" title="Mental chronometry">Mental chronometry</a></li> <li><a href="/wiki/Decimal_time" title="Decimal time">Decimal time</a></li> <li><a href="/wiki/Metric_time" title="Metric time">Metric time</a></li> <li><a href="/wiki/System_time" title="System time">System time</a></li> <li><a href="/wiki/Time_metrology" class="mw-redirect" title="Time metrology">Time metrology</a></li> <li><a href="/wiki/Time_value_of_money" title="Time value of money">Time value of money</a></li> <li><a href="/wiki/Timekeeper" title="Timekeeper">Timekeeper</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Parts_of_a_day" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Parts_of_a_day" title="Template:Parts of a day"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Parts_of_a_day" title="Template talk:Parts of a day"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Parts_of_a_day" title="Special:EditPage/Template:Parts of a day"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Parts_of_a_day" style="font-size:114%;margin:0 4em">Parts of a <a class="mw-selflink selflink">day</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Daytime" title="Daytime">Daytime</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Morning" title="Morning">Morning</a></li> <li><a href="/wiki/Noon" title="Noon">Noon</a></li> <li><a href="/wiki/Afternoon" title="Afternoon">Afternoon</a></li> <li><a href="/wiki/Evening" title="Evening">Evening</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="4" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:Sun_and_Moon_Nuremberg_chronicle.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/09/Sun_and_Moon_Nuremberg_chronicle.jpg/100px-Sun_and_Moon_Nuremberg_chronicle.jpg" decoding="async" width="100" height="97" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/09/Sun_and_Moon_Nuremberg_chronicle.jpg/150px-Sun_and_Moon_Nuremberg_chronicle.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/09/Sun_and_Moon_Nuremberg_chronicle.jpg/200px-Sun_and_Moon_Nuremberg_chronicle.jpg 2x" data-file-width="245" data-file-height="237" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Twilight" title="Twilight">Twilight</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Dawn" title="Dawn">Dawn</a></li> <li><a href="/wiki/Sunrise" title="Sunrise">Sunrise</a></li> <li><a href="/wiki/Sunset" title="Sunset">Sunset</a></li> <li><a href="/wiki/Dusk" title="Dusk">Dusk</a></li> <li><a href="/wiki/Blue_hour" title="Blue hour">Blue hour</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Night" title="Night">Night</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Midnight" title="Midnight">Midnight</a></li> <li><a href="/wiki/Witching_hour" title="Witching hour">Witching hour</a></li> <li><i><a href="/wiki/Brahmamuhurta" title="Brahmamuhurta">Brahmamuhurta</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Belt_of_Venus" title="Belt of Venus">Belt of Venus</a></li> <li><a href="/wiki/Golden_hour_(photography)" title="Golden hour (photography)">Golden hour</a></li> <li><a href="/wiki/Terminator_(solar)" title="Terminator (solar)">Terminator</a></li> <li><a href="/wiki/Daylight" title="Daylight">Daylight</a></li> <li><a href="/wiki/Moonlight" title="Moonlight">Moonlight</a></li> <li><a href="/wiki/Midnight_sun" title="Midnight sun">Midnight sun</a></li> <li><a href="/wiki/Polar_night" title="Polar night">Polar night</a></li> <li><a href="/wiki/Zodiacal_light" title="Zodiacal light">Zodiacal light</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="SI_units" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:SI_units" title="Template:SI units"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:SI_units" title="Template talk:SI units"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:SI_units" title="Special:EditPage/Template:SI units"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="SI_units" style="font-size:114%;margin:0 4em"><a href="/wiki/International_System_of_Units" title="International System of Units">SI units</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/SI_base_unit" title="SI base unit">Base units</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ampere" title="Ampere">ampere</a></li> <li><a href="/wiki/Candela" title="Candela">candela</a></li> <li><a href="/wiki/Kelvin" title="Kelvin">kelvin</a></li> <li><a href="/wiki/Kilogram" title="Kilogram">kilogram</a></li> <li><a href="/wiki/Metre" title="Metre">metre</a></li> <li><a href="/wiki/Mole_(unit)" title="Mole (unit)">mole</a></li> <li><a href="/wiki/Second" title="Second">second</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/SI_derived_unit" title="SI derived unit">Derived units <br />with special names</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Becquerel" title="Becquerel">becquerel</a></li> <li><a href="/wiki/Coulomb" title="Coulomb">coulomb</a></li> <li><a href="/wiki/Celsius" title="Celsius">degree Celsius</a></li> <li><a href="/wiki/Farad" title="Farad">farad</a></li> <li><a href="/wiki/Gray_(unit)" title="Gray (unit)">gray</a></li> <li><a href="/wiki/Henry_(unit)" title="Henry (unit)">henry</a></li> <li><a href="/wiki/Hertz" title="Hertz">hertz</a></li> <li><a href="/wiki/Joule" title="Joule">joule</a></li> <li><a href="/wiki/Katal" title="Katal">katal</a></li> <li><a href="/wiki/Lumen_(unit)" title="Lumen (unit)">lumen</a></li> <li><a href="/wiki/Lux" title="Lux">lux</a></li> <li><a href="/wiki/Newton_(unit)" title="Newton (unit)">newton</a></li> <li><a href="/wiki/Ohm" title="Ohm">ohm</a></li> <li><a href="/wiki/Pascal_(unit)" title="Pascal (unit)">pascal</a></li> <li><a href="/wiki/Radian" title="Radian">radian</a></li> <li><a href="/wiki/Siemens_(unit)" title="Siemens (unit)">siemens</a></li> <li><a href="/wiki/Sievert" title="Sievert">sievert</a></li> <li><a href="/wiki/Steradian" title="Steradian">steradian</a></li> <li><a href="/wiki/Tesla_(unit)" title="Tesla (unit)">tesla</a></li> <li><a href="/wiki/Volt" title="Volt">volt</a></li> <li><a href="/wiki/Watt" title="Watt">watt</a></li> <li><a href="/wiki/Weber_(unit)" title="Weber (unit)">weber</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Non-SI_units_mentioned_in_the_SI" title="Non-SI units mentioned in the SI">Other accepted units</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Astronomical_unit" title="Astronomical unit">astronomical unit</a></li> <li><a href="/wiki/Dalton_(unit)" title="Dalton (unit)">dalton</a></li> <li><a class="mw-selflink selflink">day</a></li> <li><a href="/wiki/Decibel" title="Decibel">decibel</a></li> <li><a href="/wiki/Degree_(angle)" title="Degree (angle)">degree of arc</a></li> <li><a href="/wiki/Electronvolt" title="Electronvolt">electronvolt</a></li> <li><a href="/wiki/Hectare" title="Hectare">hectare</a></li> <li><a href="/wiki/Hour" title="Hour">hour</a></li> <li><a href="/wiki/Litre" title="Litre">litre</a></li> <li><a href="/wiki/Minute" title="Minute">minute</a></li> <li><a href="/wiki/Minute_and_second_of_arc" title="Minute and second of arc">minute and second of arc</a></li> <li><a href="/wiki/Neper" title="Neper">neper</a></li> <li><a href="/wiki/Tonne" title="Tonne">tonne</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">See also</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Conversion_of_units" title="Conversion of units">Conversion of units</a></li> <li><a href="/wiki/Metric_prefix" title="Metric prefix">Metric prefixes</a></li> <li><a href="/wiki/Historical_definitions_of_the_SI_base_units" title="Historical definitions of the SI base units">Historical definitions of the SI base units</a></li> <li><a href="/wiki/2019_revision_of_the_SI" title="2019 revision of the SI">2019 revision of the SI</a></li> <li><a href="/wiki/System_of_units_of_measurement" title="System of units of measurement">System of units of measurement</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:SI_units" title="Category:SI units">Category</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link 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