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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-Equinoxes_on_Earth" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Equinoxes_on_Earth"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Equinoxes on Earth</span> </div> </a> <button aria-controls="toc-Equinoxes_on_Earth-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 Equinoxes on Earth subsection</span> </button> <ul id="toc-Equinoxes_on_Earth-sublist" class="vector-toc-list"> <li id="toc-General" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#General"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>General</span> </div> </a> <ul id="toc-General-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Date" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Date"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Date</span> </div> </a> <ul id="toc-Date-sublist" class="vector-toc-list"> <li id="toc-Modern_dates" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Modern_dates"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2.1</span> <span>Modern dates</span> </div> </a> <ul id="toc-Modern_dates-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Names" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Names"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Names</span> </div> </a> <ul id="toc-Names-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Length_of_equinoctial_day_and_night" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Length_of_equinoctial_day_and_night"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>Length of equinoctial day and night</span> </div> </a> <ul id="toc-Length_of_equinoctial_day_and_night-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Auroras" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Auroras"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.5</span> <span>Auroras</span> </div> </a> <ul id="toc-Auroras-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Cultural_aspects" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cultural_aspects"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.6</span> <span>Cultural aspects</span> </div> </a> <ul id="toc-Cultural_aspects-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Effects_on_satellites" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Effects_on_satellites"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Effects on satellites</span> </div> </a> <ul id="toc-Effects_on_satellites-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Equinoxes_on_other_planets" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Equinoxes_on_other_planets"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Equinoxes on other planets</span> </div> </a> <ul id="toc-Equinoxes_on_other_planets-sublist" class="vector-toc-list"> </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">4</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Footnotes" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Footnotes"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Footnotes</span> </div> </a> <ul id="toc-Footnotes-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">6</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">7</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">Equinox</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 97 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-97" 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">97 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-en-nag-ewening" title="Dag-en-nag-ewening – Afrikaans" lang="af" hreflang="af" data-title="Dag-en-nag-ewening" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ang mw-list-item"><a href="https://ang.wikipedia.org/wiki/Efenniht" title="Efenniht – Old English" lang="ang" hreflang="ang" data-title="Efenniht" 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/%D8%A7%D8%B9%D8%AA%D8%AF%D8%A7%D9%84_%D8%B4%D9%85%D8%B3%D9%8A" title="اعتدال شمسي – Arabic" lang="ar" hreflang="ar" data-title="اعتدال شمسي" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Equinocciu" title="Equinocciu – Asturian" lang="ast" hreflang="ast" data-title="Equinocciu" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Ekinoks" title="Ekinoks – Azerbaijani" lang="az" hreflang="az" data-title="Ekinoks" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AC%E0%A6%BF%E0%A6%B7%E0%A7%81%E0%A6%AC" title="বিষুব – Bangla" lang="bn" hreflang="bn" data-title="বিষুব" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bjn mw-list-item"><a href="https://bjn.wikipedia.org/wiki/Ekuinoks" title="Ekuinoks – Banjar" lang="bjn" hreflang="bjn" data-title="Ekuinoks" data-language-autonym="Banjar" data-language-local-name="Banjar" class="interlanguage-link-target"><span>Banjar</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%9A%D3%A9%D0%BD_%D0%BC%D0%B5%D0%BD%D3%99%D0%BD_%D1%82%D3%A9%D0%BD_%D1%82%D0%B8%D0%B3%D0%B5%D2%99%D0%BB%D3%99%D0%BD%D0%B5%D1%88%D0%B5" title="Көн менән төн тигеҙләнеше – Bashkir" lang="ba" hreflang="ba" data-title="Көн менән төн тигеҙләнеше" 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%A0%D0%B0%D1%9E%D0%BD%D0%B0%D0%B4%D0%B7%D0%B5%D0%BD%D1%81%D1%82%D0%B2%D0%B0" title="Раўнадзенства – Belarusian" lang="be" hreflang="be" data-title="Раўнадзенства" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B2%D0%BD%D0%BE%D0%B4%D0%B5%D0%BD%D1%81%D1%82%D0%B2%D0%B8%D0%B5" title="Равноденствие – Bulgarian" lang="bg" hreflang="bg" data-title="Равноденствие" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Ravnodnevnica" title="Ravnodnevnica – Bosnian" lang="bs" hreflang="bs" data-title="Ravnodnevnica" 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/Kedez" title="Kedez – Breton" lang="br" hreflang="br" data-title="Kedez" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Equinocci" title="Equinocci – Catalan" lang="ca" hreflang="ca" data-title="Equinocci" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Rovnodennost" title="Rovnodennost – Czech" lang="cs" hreflang="cs" data-title="Rovnodennost" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-sn mw-list-item"><a href="https://sn.wikipedia.org/wiki/Tsazahusiku" title="Tsazahusiku – Shona" lang="sn" hreflang="sn" data-title="Tsazahusiku" data-language-autonym="ChiShona" data-language-local-name="Shona" class="interlanguage-link-target"><span>ChiShona</span></a></li><li class="interlanguage-link interwiki-cy mw-list-item"><a href="https://cy.wikipedia.org/wiki/Cyhydnos" title="Cyhydnos – Welsh" lang="cy" hreflang="cy" data-title="Cyhydnos" data-language-autonym="Cymraeg" data-language-local-name="Welsh" class="interlanguage-link-target"><span>Cymraeg</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/J%C3%A6vnd%C3%B8gn" title="Jævndøgn – Danish" lang="da" hreflang="da" data-title="Jævndøgn" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/%C3%84quinoktium" title="Äquinoktium – German" lang="de" hreflang="de" data-title="Äquinoktium" 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/Rownos%C4%87_%C5%BAe%C5%84-noc" title="Rownosć źeń-noc – Lower Sorbian" lang="dsb" hreflang="dsb" data-title="Rownosć źeń-noc" data-language-autonym="Dolnoserbski" data-language-local-name="Lower Sorbian" class="interlanguage-link-target"><span>Dolnoserbski</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/V%C3%B5rdp%C3%A4evsus" title="Võrdpäevsus – Estonian" lang="et" hreflang="et" data-title="Võrdpäevsus" 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%99%CF%83%CE%B7%CE%BC%CE%B5%CF%81%CE%AF%CE%B1" title="Ισημερία – Greek" lang="el" hreflang="el" data-title="Ισημερία" 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/Equin%C3%B3si" title="Equinósi – Emiliano-Romagnolo" lang="egl" hreflang="egl" data-title="Equinósi" 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-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Equinoccio" title="Equinoccio – Spanish" lang="es" hreflang="es" data-title="Equinoccio" 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/Ekvinokso" title="Ekvinokso – Esperanto" lang="eo" hreflang="eo" data-title="Ekvinokso" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Ekinokzio" title="Ekinokzio – Basque" lang="eu" hreflang="eu" data-title="Ekinokzio" 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%A7%D8%B9%D8%AA%D8%AF%D8%A7%D9%84%DB%8C%D9%86" title="اعتدالین – Persian" lang="fa" hreflang="fa" data-title="اعتدالین" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C3%89quinoxe" title="Équinoxe – French" lang="fr" hreflang="fr" data-title="Équinoxe" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/C%C3%B3nocht" title="Cónocht – Irish" lang="ga" hreflang="ga" data-title="Cónocht" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Equinoccio" title="Equinoccio – Galician" lang="gl" hreflang="gl" data-title="Equinoccio" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%B8%E0%AA%AE%E0%AA%AA%E0%AB%8D%E0%AA%B0%E0%AA%95%E0%AA%BE%E0%AA%B6%E0%AB%80%E0%AA%AF_%E0%AA%98%E0%AA%9F%E0%AA%A8%E0%AA%BE_%E0%AA%95%E0%AB%87_%E0%AA%B5%E0%AA%BF%E0%AA%B7%E0%AB%81%E0%AA%B5%E0%AA%95%E0%AA%BE%E0%AA%B2" title="સમપ્રકાશીય ઘટના કે વિષુવકાલ – Gujarati" lang="gu" hreflang="gu" data-title="સમપ્રકાશીય ઘટના કે વિષુવકાલ" data-language-autonym="ગુજરાતી" data-language-local-name="Gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%B6%84%EC%A0%90" title="분점 – Korean" lang="ko" hreflang="ko" data-title="분점" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B3%D5%AB%D5%B7%D5%A5%D6%80%D5%A1%D5%B0%D5%A1%D5%BE%D5%A1%D5%BD%D5%A1%D6%80" title="Գիշերահավասար – Armenian" lang="hy" hreflang="hy" data-title="Գիշերահավասար" 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%B5%E0%A4%BF%E0%A4%B7%E0%A5%81%E0%A4%B5" title="विषुव – Hindi" lang="hi" hreflang="hi" data-title="विषुव" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Ravnodnevica" title="Ravnodnevica – Croatian" lang="hr" hreflang="hr" data-title="Ravnodnevica" 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/Equinoxo" title="Equinoxo – Ido" lang="io" hreflang="io" data-title="Equinoxo" 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/Equinox" title="Equinox – Igbo" lang="ig" hreflang="ig" data-title="Equinox" data-language-autonym="Igbo" data-language-local-name="Igbo" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Ekuinoks" title="Ekuinoks – Indonesian" lang="id" hreflang="id" data-title="Ekuinoks" 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-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Jafnd%C3%A6gur" title="Jafndægur – Icelandic" lang="is" hreflang="is" data-title="Jafndægur" 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/Equinozio" title="Equinozio – Italian" lang="it" hreflang="it" data-title="Equinozio" 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%A0%D7%A7%D7%95%D7%93%D7%AA_%D7%94%D7%A9%D7%95%D7%95%D7%99%D7%95%D7%9F" title="נקודת השוויון – Hebrew" lang="he" hreflang="he" data-title="נקודת השוויון" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%B5%E0%B2%BF%E0%B2%B7%E0%B3%81%E0%B2%B5%E0%B2%A4%E0%B3%8D_%E0%B2%B8%E0%B2%82%E0%B2%95%E0%B3%8D%E0%B2%B0%E0%B2%BE%E0%B2%82%E0%B2%A4%E0%B2%BF" title="ವಿಷುವತ್ ಸಂಕ್ರಾಂತಿ – Kannada" lang="kn" hreflang="kn" data-title="ವಿಷುವತ್ ಸಂಕ್ರಾಂತಿ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="Kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%91%E1%83%A3%E1%83%9C%E1%83%98%E1%83%9D%E1%83%91%E1%83%90" title="ბუნიობა – Georgian" lang="ka" hreflang="ka" data-title="ბუნიობა" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Sikusare" title="Sikusare – Swahili" lang="sw" hreflang="sw" data-title="Sikusare" 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/Ekin%C3%B2ks" title="Ekinòks – Haitian Creole" lang="ht" hreflang="ht" data-title="Ekinòks" 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-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/Ek%C3%AEnoks" title="Ekînoks – Kurdish" lang="ku" hreflang="ku" data-title="Ekînoks" 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%9A%D2%AF%D0%B7%D0%B3%D2%AF_%D0%BA%D2%AF%D0%BD-%D1%82%D2%AF%D0%BD_%D1%82%D0%B5%D2%A3%D0%B5%D0%BB%D2%AF%D2%AF_%D1%87%D0%B5%D0%BA%D0%B8%D1%82%D0%B8" title="Күзгү күн-түн теңелүү чекити – Kyrgyz" lang="ky" hreflang="ky" data-title="Күзгү күн-түн теңелүү чекити" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Aequinoctium" title="Aequinoctium – Latin" lang="la" hreflang="la" data-title="Aequinoctium" 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/Ekvinokcija" title="Ekvinokcija – Latvian" lang="lv" hreflang="lv" data-title="Ekvinokcija" 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/Equinoxe" title="Equinoxe – Luxembourgish" lang="lb" hreflang="lb" data-title="Equinoxe" 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/Lygiadienis" title="Lygiadienis – Lithuanian" lang="lt" hreflang="lt" data-title="Lygiadienis" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-jbo mw-list-item"><a href="https://jbo.wikipedia.org/wiki/cteduncitsi" title="cteduncitsi – Lojban" lang="jbo" hreflang="jbo" data-title="cteduncitsi" 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-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Nap-%C3%A9j_egyenl%C5%91s%C3%A9g" title="Nap-éj egyenlőség – Hungarian" lang="hu" hreflang="hu" data-title="Nap-éj egyenlőség" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A0%D0%B0%D0%BC%D0%BD%D0%BE%D0%B4%D0%B5%D0%BD%D0%B8%D1%86%D0%B0" title="Рамноденица – Macedonian" lang="mk" hreflang="mk" data-title="Рамноденица" 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/Ekin%C3%B4ksa" title="Ekinôksa – Malagasy" lang="mg" hreflang="mg" data-title="Ekinôksa" 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%B5%E0%B4%BF%E0%B4%B7%E0%B5%81%E0%B4%B5%E0%B4%82" title="വിഷുവം – Malayalam" lang="ml" hreflang="ml" data-title="വിഷുവം" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%91%E1%83%A3%E1%83%9C%E1%83%9D%E1%83%91%E1%83%90" title="ბუნობა – Mingrelian" lang="xmf" hreflang="xmf" data-title="ბუნობა" data-language-autonym="მარგალური" data-language-local-name="Mingrelian" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Ekuinoks" title="Ekuinoks – Malay" lang="ms" hreflang="ms" data-title="Ekuinoks" 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/H%C5%ADng-di%C4%93ng" title="Hŭng-diēng – Mindong" lang="cdo" hreflang="cdo" data-title="Hŭng-diēng" 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-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Equinox" title="Equinox – Dutch" lang="nl" hreflang="nl" data-title="Equinox" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%88%86%E7%82%B9" title="分点 – Japanese" lang="ja" hreflang="ja" data-title="分点" 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-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Jevnd%C3%B8gn" title="Jevndøgn – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Jevndøgn" 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-nrm mw-list-item"><a href="https://nrm.wikipedia.org/wiki/%C3%89tchinosse" title="Étchinosse – Norman" lang="nrf" hreflang="nrf" data-title="Étchinosse" 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/Equin%C3%B2cci" title="Equinòcci – Occitan" lang="oc" hreflang="oc" data-title="Equinòcci" 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%9A%D0%B5%D1%87%D1%8B%D1%82%D3%A7%D1%80" title="Кечытӧр – Eastern Mari" lang="mhr" hreflang="mhr" data-title="Кечытӧр" 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/Teng_kunlik" title="Teng kunlik – Uzbek" lang="uz" hreflang="uz" data-title="Teng kunlik" 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%B8%E0%A8%AE%E0%A8%B0%E0%A8%BE%E0%A8%A4" title="ਸਮਰਾਤ – Punjabi" lang="pa" hreflang="pa" data-title="ਸਮਰਾਤ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-km mw-list-item"><a href="https://km.wikipedia.org/wiki/%E1%9E%9F%E1%9E%98%E1%9E%97%E1%9E%B6%E1%9E%96%E2%80%8B%E1%9E%9A%E1%9E%B6%E1%9E%8F%E1%9F%92%E1%9E%9A%E1%9E%B8" title="សមភាពរាត្រី – Khmer" lang="km" hreflang="km" data-title="សមភាពរាត្រី" data-language-autonym="ភាសាខ្មែរ" data-language-local-name="Khmer" class="interlanguage-link-target"><span>ភាសាខ្មែរ</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/R%C3%B3wnonoc" title="Równonoc – Polish" lang="pl" hreflang="pl" data-title="Równonoc" 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/Equin%C3%B3cio" title="Equinócio – Portuguese" lang="pt" hreflang="pt" data-title="Equinócio" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Echinoc%C8%9Biu" title="Echinocțiu – Romanian" lang="ro" hreflang="ro" data-title="Echinocțiu" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A0%D0%B0%D0%B2%D0%BD%D0%BE%D0%B4%D0%B5%D0%BD%D1%81%D1%82%D0%B2%D0%B8%D0%B5" title="Равноденствие – Russian" lang="ru" hreflang="ru" data-title="Равноденствие" 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_%D1%82%D1%8D%D2%A5%D0%BD%D1%8D%D2%BB%D0%B8%D0%B8%D1%82%D1%8D" title="Күн тэҥнэһиитэ – Yakut" lang="sah" hreflang="sah" data-title="Күн тэҥнэһиитэ" 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-sc mw-list-item"><a href="https://sc.wikipedia.org/wiki/Ecuin%C3%B2tziu" title="Ecuinòtziu – Sardinian" lang="sc" hreflang="sc" data-title="Ecuinòtziu" data-language-autonym="Sardu" data-language-local-name="Sardinian" class="interlanguage-link-target"><span>Sardu</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Ekuinoksi" title="Ekuinoksi – Albanian" lang="sq" hreflang="sq" data-title="Ekuinoksi" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Equinox" title="Equinox – Simple English" lang="en-simple" hreflang="en-simple" data-title="Equinox" 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-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Rovnodennos%C5%A5" title="Rovnodennosť – Slovak" lang="sk" hreflang="sk" data-title="Rovnodennosť" 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/Enakono%C4%8Dje" title="Enakonočje – Slovenian" lang="sl" hreflang="sl" data-title="Enakonočje" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DB%8C%DB%95%DA%A9%D8%B3%D8%A7%D9%86%DB%8C%DB%8C_%DA%BE%DB%95%D8%AA%D8%A7%D9%88%DB%8C" title="یەکسانیی ھەتاوی – Central Kurdish" lang="ckb" hreflang="ckb" data-title="یەکسانیی ھەتاوی" 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%A0%D0%B0%D0%B2%D0%BD%D0%BE%D0%B4%D0%BD%D0%B5%D0%B2%D0%B8%D1%86%D0%B0" title="Равнодневица – Serbian" lang="sr" hreflang="sr" data-title="Равнодневица" 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/Ekvinocij" title="Ekvinocij – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Ekvinocij" 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/%C3%89kuinoks" title="Ékuinoks – Sundanese" lang="su" hreflang="su" data-title="Ékuinoks" 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/P%C3%A4iv%C3%A4ntasaus" title="Päiväntasaus – Finnish" lang="fi" hreflang="fi" data-title="Päiväntasaus" 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/Dagj%C3%A4mning" title="Dagjämning – Swedish" lang="sv" hreflang="sv" data-title="Dagjämning" 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/Ekinoksiyo" title="Ekinoksiyo – Tagalog" lang="tl" hreflang="tl" data-title="Ekinoksiyo" 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%9A%E0%AE%AE_%E0%AE%87%E0%AE%B0%E0%AE%B5%E0%AF%81_%E0%AE%A8%E0%AE%BE%E0%AE%B3%E0%AF%8D" title="சம இரவு நாள் – Tamil" lang="ta" hreflang="ta" data-title="சம இரவு நாள்" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Aggad_anafuk" title="Aggad anafuk – Kabyle" lang="kab" hreflang="kab" data-title="Aggad anafuk" 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%9A%D3%A9%D0%BD-%D1%82%D3%A9%D0%BD_%D1%82%D0%B8%D0%B3%D0%B5%D0%B7%D0%BB%D0%B5%D0%B3%D0%B5" title="Көн-төн тигезлеге – Tatar" lang="tt" hreflang="tt" data-title="Көн-төн тигезлеге" 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-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%B5%E0%B0%BF%E0%B0%B7%E0%B1%81%E0%B0%B5%E0%B0%A4%E0%B1%8D%E0%B0%A4%E0%B1%81" title="విషువత్తు – Telugu" lang="te" hreflang="te" data-title="విషువత్తు" 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%B4%E0%B8%A9%E0%B8%B8%E0%B8%A7%E0%B8%B1%E0%B8%95" title="วิษุวัต – Thai" lang="th" hreflang="th" data-title="วิษุวัต" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Ekinoks" title="Ekinoks – Turkish" lang="tr" hreflang="tr" 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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">This article is about an astronomical event. For the celestial coordinates, see <a href="/wiki/Equinox_(celestial_coordinates)" title="Equinox (celestial coordinates)">Equinox (celestial coordinates)</a>. For other uses, see <a href="/wiki/Equinox_(disambiguation)" class="mw-disambig" title="Equinox (disambiguation)">Equinox (disambiguation)</a>.</div> <p class="mw-empty-elt"> </p> <table class="wikitable" style="font-size:85%; text-align:center; float:right; clear:right; margin:0 0 1em 1em;"> <caption><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Universal_Time" title="Universal Time">UT</a> date and time of <br /><a class="mw-selflink selflink">equinoxes</a> and <a href="/wiki/Solstice" title="Solstice">solstices</a> on Earth<sup id="cite_ref-USNO_1-0" class="reference"><a href="#cite_note-USNO-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><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></div> </caption> <tbody><tr> <th scope="row">event </th> <th scope="colgroup" colspan="2"><a href="/wiki/March_equinox" title="March equinox">equinox</a> </th> <th scope="colgroup" colspan="2"><a href="/wiki/June_solstice" title="June solstice">solstice</a> </th> <th scope="colgroup" colspan="2"><a href="/wiki/September_equinox" title="September equinox">equinox</a> </th> <th scope="colgroup" colspan="2"><a href="/wiki/December_solstice" title="December solstice">solstice</a> </th></tr> <tr> <th scope="row">month </th> <th scope="colgroup" colspan="2">March<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> </th> <th scope="colgroup" colspan="2">June<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> </th> <th scope="colgroup" colspan="2">September<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> </th> <th scope="colgroup" colspan="2">December<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </th></tr> <tr> <th scope="col">year </th> <th scope="col">day</th> <th scope="col">time </th> <th scope="col">day</th> <th scope="col">time </th> <th scope="col">day</th> <th scope="col">time </th> <th scope="col">day</th> <th scope="col">time </th></tr> <tr> <th scope="row">2019 </th> <td>20</td> <td>21:58</td> <td>21</td> <td>15:54</td> <td>23</td> <td>07:50</td> <td>22</td> <td>04:19 </td></tr> <tr> <th scope="row">2020 </th> <td>20</td> <td>03:50</td> <td>20</td> <td>21:43</td> <td>22</td> <td>13:31</td> <td>21</td> <td>10:03 </td></tr> <tr> <th scope="row">2021 </th> <td>20</td> <td>09:37</td> <td>21</td> <td>03:32</td> <td>22</td> <td>19:21</td> <td>21</td> <td>15:59 </td></tr> <tr> <th scope="row">2022 </th> <td>20</td> <td>15:33</td> <td>21</td> <td>09:14</td> <td>23</td> <td>01:04</td> <td>21</td> <td>21:48 </td></tr> <tr> <th scope="row">2023 </th> <td>20</td> <td>21:25</td> <td>21</td> <td>14:58</td> <td>23</td> <td>06:50</td> <td>22</td> <td>03:28 </td></tr> <tr style="background-color:gold;"> <th scope="row" style="background-color:gold;">2024 </th> <td>20</td> <td>03:07</td> <td>20</td> <td>20:51</td> <td>22</td> <td>12:44</td> <td>21</td> <td>09:20 </td></tr> <tr> <th scope="row">2025 </th> <td>20</td> <td>09:02</td> <td>21</td> <td>02:42</td> <td>22</td> <td>18:20</td> <td>21</td> <td>15:03 </td></tr> <tr> <th scope="row">2026 </th> <td>20</td> <td>14:46</td> <td>21</td> <td>08:25</td> <td>23</td> <td>00:06</td> <td>21</td> <td>20:50 </td></tr> <tr> <th scope="row">2027 </th> <td>20</td> <td>20:25</td> <td>21</td> <td>14:11</td> <td>23</td> <td>06:02</td> <td>22</td> <td>02:43 </td></tr> <tr> <th scope="row">2028 </th> <td>20</td> <td>02:17</td> <td>20</td> <td>20:02</td> <td>22</td> <td>11:45</td> <td>21</td> <td>08:20 </td></tr> <tr> <th scope="row">2029 </th> <td>20</td> <td>08:01</td> <td>21</td> <td>01:48</td> <td>22</td> <td>17:37</td> <td>21</td> <td>14:14 </td></tr> </tbody></table> <p>A solar <b>equinox</b> is a moment in time when the <a href="/wiki/Sun" title="Sun">Sun</a> crosses the Earth's <a href="/wiki/Equator" title="Equator">equator</a>, which is to say, appears <a href="/wiki/Zenith" title="Zenith">directly above</a> the equator, rather than north or south of the equator. On the day of the equinox, the Sun appears to rise "due east" and set "due west". This occurs twice each year, around <a href="/wiki/March_equinox" title="March equinox">20 March</a> and <a href="/wiki/September_equinox" title="September equinox">23 September</a>.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>a<span class="cite-bracket">]</span></a></sup> </p><p>More precisely, an equinox is traditionally defined as the time when <a href="/wiki/Celestial_equator" title="Celestial equator">the plane</a> of <a href="/wiki/Earth" title="Earth">Earth</a>'s <a href="/wiki/Equator" title="Equator">equator</a> passes through the geometric center of the <a href="/wiki/Sun" title="Sun">Sun</a>'s disk.<sup id="cite_ref-USNO_FAQ_8-0" class="reference"><a href="#cite_note-USNO_FAQ-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Equivalently, this is the moment when <a href="/wiki/Earth%27s_rotation_axis" class="mw-redirect" title="Earth's rotation axis">Earth's rotation axis</a> is directly perpendicular to the Sun-Earth line, tilting neither toward nor away from the Sun. In modern times<sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers#Chronological_items" title="Wikipedia:Manual of Style/Dates and numbers"><span title="The time period mentioned near this tag is ambiguous. (February 2023)">when?</span></a></i>]</sup>, since the Moon (and to a lesser extent the planets) causes <a href="/wiki/Earth%27s_orbit" title="Earth's orbit">Earth's orbit</a> to <a href="/wiki/Perturbation_(astronomy)" title="Perturbation (astronomy)">vary slightly</a> from a <a href="/wiki/Elliptic_orbit" title="Elliptic orbit">perfect ellipse</a>, the equinox is officially defined by the Sun's more regular <a href="/wiki/Ecliptic_coordinate_system" title="Ecliptic coordinate system">ecliptic longitude</a> rather than by its <a href="/wiki/Declination_of_the_Sun" class="mw-redirect" title="Declination of the Sun">declination</a>. The instants of the equinoxes are currently defined to be when the apparent geocentric longitude of the Sun is 0° and 180°.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>The word is derived from the <a href="/wiki/Latin" title="Latin">Latin</a> <i><span title="Latin-language text"><i lang="la">aequinoctium</i></span></i>, from <i><span title="Latin-language text"><i lang="la">aequus</i></span></i> (equal) and <i><span title="Latin-language text"><i lang="la">nox</i></span></i> (night). On the day of an equinox, daytime and nighttime are of approximately equal duration all over the planet. Contrary to popular belief,<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> they are not exactly equal because of the <a href="/wiki/Angular_diameter" title="Angular diameter">angular size</a> of the Sun, <a href="/wiki/Atmospheric_refraction" title="Atmospheric refraction">atmospheric refraction</a>, and the rapidly changing duration of the length of day that occurs at most latitudes around the equinoxes. Long before conceiving this equality, equatorial cultures noted the day when the Sun rises due <a href="/wiki/East" title="East">east</a> and sets due <a href="/wiki/West" title="West">west</a>, and indeed this happens on the day closest to the astronomically defined event. As a consequence, according to a properly constructed and aligned <a href="/wiki/Sundial" title="Sundial">sundial</a>, the daytime duration is 12 hours. </p><p>In the <a href="/wiki/Northern_Hemisphere" title="Northern Hemisphere">Northern Hemisphere</a>, the <a href="/wiki/March_equinox" title="March equinox">March equinox</a> is called the vernal or spring equinox while the <a href="/wiki/September_equinox" title="September equinox">September equinox</a> is called the autumnal or fall equinox. In the <a href="/wiki/Southern_Hemisphere" title="Southern Hemisphere">Southern Hemisphere</a>, the reverse is true. During the year, equinoxes alternate with <a href="/wiki/Solstice" title="Solstice">solstices</a>. <a href="/wiki/Leap_year" title="Leap year">Leap years</a> and other factors cause the dates of both events to vary slightly.<sup id="cite_ref-YallopEtAl_13-0" class="reference"><a href="#cite_note-YallopEtAl-13"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>Hemisphere-neutral names are <i>northward equinox</i> for the <a href="/wiki/March_equinox" title="March equinox">March equinox</a>, indicating that at that moment the solar declination is crossing the celestial equator in a northward direction, and <i>southward equinox</i> for the <a href="/wiki/September_equinox" title="September equinox">September equinox</a>, indicating that at that moment the solar declination is crossing the celestial equator in a southward direction. </p><p><a href="/wiki/Daytime" title="Daytime">Daytime</a> is increasing at the fastest at the vernal equinox and decreasing at the fastest at the autumnal equinox. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Equinoxes_on_Earth">Equinoxes on Earth</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=1" title="Edit section: Equinoxes on Earth"><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/Sun_path" title="Sun path">Sun path</a></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/Equinox_(celestial_coordinates)" title="Equinox (celestial coordinates)">Equinox (celestial coordinates)</a></div> <div class="mw-heading mw-heading3"><h3 id="General">General</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=2" title="Edit section: General"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Systematically observing the <a href="/wiki/Sunrise" title="Sunrise">sunrise</a>, people discovered that it occurs between two extreme locations at the <a href="/wiki/Horizon" title="Horizon">horizon</a> and eventually noted the midpoint between the two. Later it was realized that this happens on a day when the duration of the day and the night are practically equal and the word "equinox" comes from Latin <i>aequus</i>, meaning "equal", and <i>nox</i>, meaning "night". </p><p>In the northern hemisphere, the <i>vernal equinox</i> (March) conventionally marks the beginning of <a href="/wiki/Spring_(season)" title="Spring (season)">spring</a> in most cultures and is considered the start of the New Year in the <a href="/wiki/Assyrian_calendar" title="Assyrian calendar">Assyrian calendar</a>, Hindu, and the Persian or <a href="/wiki/Iranian_calendar" class="mw-redirect" title="Iranian calendar">Iranian calendars</a>,<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>b<span class="cite-bracket">]</span></a></sup> while the <i>autumnal equinox</i> (September) marks the beginning of autumn.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> Ancient Greek calendars too had the beginning of the year either at the autumnal or vernal equinox and some at solstices. The <a href="/wiki/Antikythera_mechanism" title="Antikythera mechanism">Antikythera mechanism</a> predicts the equinoxes and solstices.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 190px;"><span typeof="mw:File"><a href="/wiki/File:Earth-lighting-equinox_EN.png" class="mw-file-description" title="Illumination of Earth by the Sun at the equinox"><img alt="Illumination of Earth by the Sun at the equinox" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/84/Earth-lighting-equinox_EN.png/200px-Earth-lighting-equinox_EN.png" decoding="async" width="200" height="131" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/84/Earth-lighting-equinox_EN.png/300px-Earth-lighting-equinox_EN.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/84/Earth-lighting-equinox_EN.png/400px-Earth-lighting-equinox_EN.png 2x" data-file-width="1560" data-file-height="1024" /></a></span></div> <div class="gallerytext">Illumination of <a href="/wiki/Earth" title="Earth">Earth</a> by the <a href="/wiki/Sun" title="Sun">Sun</a> at the equinox</div> </li> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 190px;"><span typeof="mw:File"><a href="/wiki/File:Ecliptic_path.jpg" class="mw-file-description" title="The relation between the Earth, Sun, and stars at the March equinox. From Earth's perspective, the Sun appears to move along the ecliptic (red), which is tilted compared to the celestial equator (white)."><img alt="The relation between the Earth, Sun, and stars at the March equinox. From Earth's perspective, the Sun appears to move along the ecliptic (red), which is tilted compared to the celestial equator (white)." src="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Ecliptic_path.jpg/200px-Ecliptic_path.jpg" decoding="async" width="200" height="150" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Ecliptic_path.jpg/300px-Ecliptic_path.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/de/Ecliptic_path.jpg/400px-Ecliptic_path.jpg 2x" data-file-width="2000" data-file-height="1500" /></a></span></div> <div class="gallerytext">The relation between the Earth, Sun, and stars at the March equinox. From Earth's perspective, the Sun appears to move along the <a href="/wiki/Ecliptic" title="Ecliptic">ecliptic</a> (red), which is tilted compared to the <a href="/wiki/Celestial_equator" title="Celestial equator">celestial equator</a> (white).</div> </li> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 190px;"><span typeof="mw:File"><a href="/wiki/File:North_season.jpg" class="mw-file-description" title="Diagram of the Earth's seasons as seen from the north. Far right: December solstice."><img alt="Diagram of the Earth's seasons as seen from the north. Far right: December solstice." src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8b/North_season.jpg/200px-North_season.jpg" decoding="async" width="200" height="108" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8b/North_season.jpg/300px-North_season.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8b/North_season.jpg/400px-North_season.jpg 2x" data-file-width="2563" data-file-height="1382" /></a></span></div> <div class="gallerytext">Diagram of the Earth's <a href="/wiki/Season" title="Season">seasons</a> as seen from the north. Far right: December solstice.</div> </li> <li class="gallerybox" style="width: 235px"> <div class="thumb" style="width: 230px; height: 190px;"><span typeof="mw:File"><a href="/wiki/File:South_season.jpg" class="mw-file-description" title="Diagram of the Earth's seasons as seen from the south. Far left: June solstice."><img alt="Diagram of the Earth's seasons as seen from the south. Far left: June solstice." src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6a/South_season.jpg/200px-South_season.jpg" decoding="async" width="200" height="110" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6a/South_season.jpg/300px-South_season.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6a/South_season.jpg/400px-South_season.jpg 2x" data-file-width="2000" data-file-height="1100" /></a></span></div> <div class="gallerytext">Diagram of the Earth's seasons as seen from the south. Far left: June solstice.</div> </li> </ul> <p>The equinoxes are the only times when the <a href="/wiki/Terminator_(solar)" title="Terminator (solar)">solar terminator</a> (the "edge" between night and day) is perpendicular to the equator. As a result, the northern and southern <a href="/wiki/Hemispheres_of_the_Earth" class="mw-redirect" title="Hemispheres of the Earth">hemispheres</a> are equally illuminated. </p><p>For the same reason, this is also the time when the Sun rises for an observer at one of Earth's rotational poles and sets at the other. For a brief period lasting approximately four days, both North and South Poles are in daylight.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>c<span class="cite-bracket">]</span></a></sup> For example, in 2021 sunrise on the North Pole is 18 March 07:09 UTC, and sunset on the South Pole is 22 March 13:08 UTC. Also in 2021, sunrise on the South Pole is 20 September 16:08 UTC, and sunset on the North Pole is 24 September 22:30 UTC.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p><p>In other words, the equinoxes are the only times when the <a href="/wiki/Subsolar_point" title="Subsolar point">subsolar point</a> is on the equator, meaning that the Sun is <a href="/wiki/Zenith" title="Zenith">exactly overhead</a> at a point on the equatorial line. The subsolar point crosses the equator moving northward at the March equinox and southward at the September equinox. </p> <div class="mw-heading mw-heading3"><h3 id="Date">Date</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=3" title="Edit section: Date"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When <a href="/wiki/Julius_Caesar" title="Julius Caesar">Julius Caesar</a> established the <a href="/wiki/Julian_calendar" title="Julian calendar">Julian calendar</a> in 45 BC, he set 25 March as the date of the spring equinox;<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> this was already the starting day of the year in the Persian and Indian calendars. Because the Julian year is longer than the <a href="/wiki/Tropical_year" title="Tropical year">tropical year</a> by about 11.3 minutes on average (or 1 day in 128 years), the calendar "drifted" with respect to the two equinoxes – so that in <a href="/wiki/First_Council_of_Nicaea" title="First Council of Nicaea">300 AD</a> the spring equinox occurred on about 21 March, and by the 1580s AD it had drifted backwards to 11 March.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p><p>This drift induced <a href="/wiki/Pope_Gregory_XIII" title="Pope Gregory XIII">Pope Gregory XIII</a> to establish the modern <a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian calendar</a>. The Pope wanted to continue to conform with the edicts of the <a href="/wiki/First_Council_of_Nicaea" title="First Council of Nicaea">Council of Nicaea</a> in 325 AD concerning the <a href="/wiki/Easter_controversy#Second_phase" title="Easter controversy">date of Easter</a>, which means he wanted to move the vernal equinox to the date on which it fell at that time (21 March is the day allocated to it in the Easter table of the Julian calendar), and to maintain it at around that date in the future, which he achieved by reducing the number of leap years from 100 to 97 every 400 years. However, there remained a small residual variation in the date and time of the vernal equinox of about ±27 hours from its mean position, virtually all because the distribution of 24 hour centurial leap-days causes large jumps (see <a href="/wiki/File:Gregoriancalendarleap_solstice.svg" title="File:Gregoriancalendarleap solstice.svg">Gregorian calendar leap solstice</a>). </p> <div class="mw-heading mw-heading4"><h4 id="Modern_dates">Modern dates</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=4" title="Edit section: Modern dates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The dates of the equinoxes change progressively during the leap-year cycle, because the Gregorian calendar year is not commensurate with the period of the Earth's revolution about the Sun. It is only after a complete Gregorian leap-year cycle of 400 years that the seasons commence at approximately the same time. In the 21st century the earliest March equinox will be 19 March 2096, while the latest was 21 March 2003. The earliest September equinox will be 21 September 2096 while the latest was 23 September 2003 (<a href="/wiki/Universal_Time" title="Universal Time">Universal Time</a>).<sup id="cite_ref-YallopEtAl_13-1" class="reference"><a href="#cite_note-YallopEtAl-13"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Names">Names</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=5" title="Edit section: Names"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Vernal equinox and autumnal equinox: these classical names are direct derivatives of Latin (<i>ver</i> = spring, and <i>autumnus</i> = autumn). These are the historically universal and still most widely used terms for the equinoxes, but are potentially confusing because in the southern hemisphere the vernal equinox does not occur in spring and the autumnal equinox does not occur in autumn. The equivalent common language English terms <i>spring equinox</i> and <i>autumn (or fall) equinox</i> are even more ambiguous.<sup id="cite_ref-Skye2007_22-0" class="reference"><a href="#cite_note-Skye2007-22"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Curtis2013_23-0" class="reference"><a href="#cite_note-Curtis2013-23"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-GrewalWeill2007_24-0" class="reference"><a href="#cite_note-GrewalWeill2007-24"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> It has become increasingly common for people to refer to the September equinox in the southern hemisphere as the Vernal equinox.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/March_equinox" title="March equinox">March equinox</a> and <a href="/wiki/September_equinox" title="September equinox">September equinox</a>: names referring to the months of the year in which they occur, with no ambiguity as to which hemisphere is the context. They are still not universal, however, as not all cultures use a solar-based calendar where the equinoxes occur every year in the same month (as they do not in the <a href="/wiki/Islamic_calendar" title="Islamic calendar">Islamic calendar</a> and <a href="/wiki/Hebrew_calendar" title="Hebrew calendar">Hebrew calendar</a>, for example).<sup id="cite_ref-LaRocque2007_27-0" class="reference"><a href="#cite_note-LaRocque2007-27"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> Although the terms have become very common in the 21st century, they were sometimes used at least as long ago as the mid-20th century.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/Northward_equinox" class="mw-redirect" title="Northward equinox">Northward equinox</a> and <a href="/wiki/Southward_equinox" class="mw-redirect" title="Southward equinox">southward equinox</a>: names referring to the apparent direction of motion of the Sun. The northward equinox occurs in March when the Sun crosses the equator from south to north, and the southward equinox occurs in September when the Sun crosses the equator from north to south. These terms can be used unambiguously for other planets. They are rarely seen, although were first proposed over 100 years ago.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/First_point_of_Aries" title="First point of Aries">First point of Aries</a> and first point of <a href="/wiki/Libra_(astrology)" title="Libra (astrology)">Libra</a>: names referring to the <a href="/wiki/Zodiac" title="Zodiac">astrological signs</a> the Sun is entering. However, the <a href="/wiki/Precession_of_the_equinoxes" class="mw-redirect" title="Precession of the equinoxes">precession of the equinoxes</a> has shifted these points into the <a href="/wiki/Constellation" title="Constellation">constellations</a> <a href="/wiki/Pisces_(constellation)" title="Pisces (constellation)">Pisces</a> and <a href="/wiki/Virgo_(constellation)" title="Virgo (constellation)">Virgo</a>, respectively.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Length_of_equinoctial_day_and_night">Length of equinoctial day and night</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=6" title="Edit section: Length of equinoctial day and night"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg/300px-Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg.png" decoding="async" width="300" height="169" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg/450px-Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg/600px-Hours_of_daylight_vs_latitude_vs_day_of_year_with_tropical_and_polar_circles.svg.png 2x" data-file-width="512" data-file-height="288" /></a><figcaption>Contour plot of the hours of daylight as a function of latitude and day of the year, showing approximately 12 hours of daylight at all latitudes during the equinoxes</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:GOES_16_September_Equinox_2022.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/GOES_16_September_Equinox_2022.jpg/220px-GOES_16_September_Equinox_2022.jpg" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/GOES_16_September_Equinox_2022.jpg/330px-GOES_16_September_Equinox_2022.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d9/GOES_16_September_Equinox_2022.jpg/440px-GOES_16_September_Equinox_2022.jpg 2x" data-file-width="10848" data-file-height="10848" /></a><figcaption>Earth at the September 2022 equinox</figcaption></figure> <p>On the date of the equinox, the center of the Sun spends a roughly equal amount of time above and below the horizon at every location on the Earth, so night and day<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>d<span class="cite-bracket">]</span></a></sup> are about the same length. Sunrise and sunset can be defined in several ways, but a widespread definition is the time that the top limb of the Sun is level with the horizon.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> With this definition, the day is longer than the night at the equinoxes:<sup id="cite_ref-USNO_FAQ_8-1" class="reference"><a href="#cite_note-USNO_FAQ-8"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <ol><li>From the Earth, the Sun appears as a disc rather than a point of light, so when the centre of the Sun is below the horizon, its upper edge may be visible. <a href="/wiki/Sunrise" title="Sunrise">Sunrise</a>, which begins daytime, occurs when the top of the Sun's disk appears above the <a href="/wiki/Horizon" title="Horizon">eastern horizon</a>. At that instant, the disk's centre is still below the horizon.</li> <li>The Earth's atmosphere <a href="/wiki/Refraction" title="Refraction">refracts</a> sunlight. As a result, an observer sees daylight before the top of the Sun's disk appears above the horizon.</li></ol> <p>In sunrise/sunset tables, the <a href="/wiki/Atmospheric_refraction" title="Atmospheric refraction">atmospheric refraction</a> is assumed to be 34 arcminutes, and the assumed semidiameter (apparent <a href="/wiki/Radius" title="Radius">radius</a>) of the Sun is 16 <a href="/wiki/Minute_and_second_of_arc" title="Minute and second of arc">arcminutes</a>. (The apparent radius varies slightly depending on time of year, slightly larger at <a href="/wiki/Perihelion_and_aphelion" class="mw-redirect" title="Perihelion and aphelion">perihelion in January than aphelion in July</a>, but the difference is comparatively small.) Their combination means that when the upper limb of the Sun is on the visible horizon, its centre is 50 arcminutes below the geometric horizon, which is the intersection with the celestial sphere of a horizontal plane through the eye of the observer.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p><p>These effects make the day about 14 minutes longer than the night at the equator and longer still towards the poles. The real equality of day and night only happens in places far enough from the equator to have a seasonal difference in day length of at least 7 minutes,<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> actually occurring a few days towards the winter side of each equinox. One result of this is that, at latitudes below ±2.0 degrees, all the days of the year are longer than the nights.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </p><p>The times of sunset and sunrise vary with the observer's location (<a href="/wiki/Longitude" title="Longitude">longitude</a> and <a href="/wiki/Latitude" title="Latitude">latitude</a>), so the dates when day and night are equal also depend upon the observer's location. </p><p>A third correction for the visual observation of a sunrise (or sunset) is the angle between the apparent horizon as seen by an observer and the geometric (or sensible) horizon. This is known as the dip of the horizon and varies from 3 arcminutes for a viewer standing on the sea shore to 160 arcminutes for a mountaineer on Everest.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> The effect of a larger dip on taller objects (reaching over 2½° of arc on Everest) accounts for the phenomenon of snow on a mountain peak turning gold in the sunlight long before the lower slopes are illuminated. </p><p>The date on which the day and night are exactly the same is known as an <i>equilux</i>; the <a href="/wiki/Neologism" title="Neologism">neologism</a>, believed to have been coined in the 1980s, achieved more widespread recognition in the 21st century.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>e<span class="cite-bracket">]</span></a></sup> At the most precise measurements, a true equilux is rare, because the lengths of day and night change more rapidly than any other time of the year around the equinoxes. In the mid-latitudes, daylight increases or decreases by about three minutes per day at the equinoxes, and thus adjacent days and nights only reach within one minute of each other. The date of the closest approximation of the equilux varies slightly by latitude; in the mid-latitudes, it occurs a few days before the spring equinox and after the fall equinox in each respective hemisphere.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Auroras">Auroras</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=7" title="Edit section: Auroras"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Mirror-image <a href="/wiki/Aurora#Conjugate_auroras" title="Aurora">conjugate auroras</a> have been observed during the equinoxes.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Cultural_aspects">Cultural aspects</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=8" title="Edit section: Cultural aspects"><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/March_equinox#Culture" title="March equinox">March equinox § Culture</a>, and <a href="/wiki/September_equinox#Culture" title="September equinox">September equinox § Culture</a></div> <p>The equinoxes are sometimes regarded as the start of spring and autumn. A number of traditional <a href="/wiki/Harvest_festival" title="Harvest festival">harvest festivals</a> are celebrated on the date of the equinoxes. </p><p>People in countries including Iran, Afghanistan, Tajikistan celebrate <a href="/wiki/Nowruz" title="Nowruz">Nowruz</a> which is spring equinox in northern hemisphere. This day marks the new year in <a href="/wiki/Solar_Hijri_calendar" title="Solar Hijri calendar">Solar Hijri calendar</a>. </p><p>Religious architecture is often determined by the equinox; the <a href="/wiki/Angkor_Wat_Equinox" title="Angkor Wat Equinox">Angkor Wat Equinox</a> during which the sun rises in a perfect alignment over <a href="/wiki/Angkor_Wat" title="Angkor Wat">Angkor Wat</a> in <a href="/wiki/Cambodia" title="Cambodia">Cambodia</a> is one such example.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Catholic_churches" class="mw-redirect" title="Catholic churches">Catholic churches</a>, since the recommendations of <a href="/wiki/Charles_Borromeo" title="Charles Borromeo">Charles Borromeo</a>, have often chosen the equinox as their reference point for the <a href="/wiki/Orientation_of_churches" title="Orientation of churches">orientation of churches</a>.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Effects_on_satellites">Effects on satellites</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=9" title="Edit section: Effects on satellites"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>One effect of equinoctial periods is the temporary disruption of <a href="/wiki/Communications_satellite" title="Communications satellite">communications satellites</a>. For all <a href="/wiki/Geostationary_orbit" title="Geostationary orbit">geostationary</a> satellites, there are a few days around the equinox when the Sun goes <a href="/wiki/Transit_(astronomy)" class="mw-redirect" title="Transit (astronomy)">directly behind</a> the satellite relative to Earth (i.e. within the beam-width of the ground-station antenna) for a short period each day. The Sun's immense power and broad radiation spectrum overload the Earth station's reception circuits with noise and, depending on antenna size and other factors, temporarily disrupt or degrade the circuit. The duration of those effects varies but can range from a few minutes to an hour. (For a given frequency band, a larger antenna has a narrower beam-width and hence experiences shorter duration "Sun outage" windows.)<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p><p>Satellites in <a href="/wiki/Geostationary_orbit" title="Geostationary orbit">geostationary orbit</a> also experience difficulties maintaining power during the equinox because they have to travel through <a href="/wiki/Earth%27s_shadow" title="Earth's shadow">Earth's shadow</a> and rely only on battery power. Usually, a satellite travels either north or south of the Earth's shadow because Earth's axis is not directly perpendicular to a line from the Earth to the Sun at other times. During the equinox, since geostationary satellites are situated above the Equator, they are in Earth's shadow for the longest duration all year.<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Equinoxes_on_other_planets">Equinoxes on other planets</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=10" title="Edit section: Equinoxes on other planets"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Saturn,_its_rings,_and_a_few_of_its_moons.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Saturn%2C_its_rings%2C_and_a_few_of_its_moons.jpg/250px-Saturn%2C_its_rings%2C_and_a_few_of_its_moons.jpg" decoding="async" width="250" height="133" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Saturn%2C_its_rings%2C_and_a_few_of_its_moons.jpg/375px-Saturn%2C_its_rings%2C_and_a_few_of_its_moons.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Saturn%2C_its_rings%2C_and_a_few_of_its_moons.jpg/500px-Saturn%2C_its_rings%2C_and_a_few_of_its_moons.jpg 2x" data-file-width="7227" data-file-height="3847" /></a><figcaption>When <a href="/wiki/Saturn" title="Saturn">Saturn</a> is at equinox its <a href="/wiki/Rings_of_Saturn" title="Rings of Saturn">rings</a> reflect little sunlight, as seen in this image by <i><a href="/wiki/Cassini%E2%80%93Huygens" title="Cassini–Huygens">Cassini</a></i> in 2009.</figcaption></figure> <p>Equinoxes are defined on any planet with a tilted rotational axis. A dramatic example is Saturn, where the equinox places its <a href="/wiki/Rings_of_Saturn" title="Rings of Saturn">ring system</a> edge-on facing the Sun. As a result, they are visible only as a thin line when seen from Earth. When seen from above – a view seen during an equinox for the first time from the <i><a href="/wiki/Cassini%E2%80%93Huygens" title="Cassini–Huygens">Cassini</a></i> space probe in 2009 – they receive very little <a href="/wiki/Sunshine" class="mw-redirect" title="Sunshine">sunshine</a>; indeed, they receive more <a href="/wiki/Planetshine" title="Planetshine">planetshine</a> than light from the Sun.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> This phenomenon occurs once every 14.7 years on average, and can last a few weeks before and after the exact equinox. Saturn's most recent equinox was on 11 August 2009, and its next will take place on 6 May 2025.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> </p><p>Mars's most recent equinoxes were on 12 January 2024 (northern autumn), and on 26 December 2022 (northern spring).<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <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=Equinox&action=edit&section=11" 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: 20em;"> <ul><li><a href="/wiki/Analemma" title="Analemma">Analemma</a></li> <li><a href="/wiki/Anjana_(Cantabrian_mythology)" title="Anjana (Cantabrian mythology)">Anjana (Cantabrian mythology)</a> – fairies believed to appear on the spring equinox</li> <li><a href="/wiki/Angkor_Wat_Equinox" title="Angkor Wat Equinox">Angkor Wat Equinox</a></li> <li><a href="/wiki/Apsis#Earth_perihelion_and_aphelion" title="Apsis">Aphelion</a> – occurs around 5 July (see formula)</li> <li><a href="/wiki/Geocentric_view_of_the_seasons" class="mw-redirect" title="Geocentric view of the seasons">Geocentric view of the seasons</a></li> <li><a href="/wiki/Iranian_calendars" title="Iranian calendars">Iranian calendars</a></li> <li><a href="/wiki/K%C5%8Dreisai" title="Kōreisai">Kōreisai</a> – days of worship in Japan that began in 1878</li> <li><a href="/wiki/Lady_Day" title="Lady Day">Lady Day</a></li> <li><a href="/wiki/Nowruz" title="Nowruz">Nowruz</a></li> <li><a href="/wiki/Orientation_of_churches" title="Orientation of churches">Orientation of churches</a></li> <li><a href="/wiki/Perihelion_and_aphelion" class="mw-redirect" title="Perihelion and aphelion">Perihelion and aphelion</a></li> <li><a href="/wiki/Solstice" title="Solstice">Solstice</a></li> <li><a href="/wiki/Songkran" class="mw-redirect" title="Songkran">Songkran</a></li> <li><a href="/wiki/Sun_outage" title="Sun outage">Sun outage</a> – a satellite phenomenon that occurs around the time of an equinox</li> <li><a href="/wiki/Tekufah" title="Tekufah">Tekufah</a></li> <li><a href="/wiki/Wheel_of_the_Year" title="Wheel of the Year">Wheel of the Year</a></li> <li><a href="/wiki/Zoroastrian_calendar" title="Zoroastrian calendar">Zoroastrian calendar</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="Footnotes">Footnotes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Equinox&action=edit&section=12" title="Edit section: Footnotes"><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 reflist-columns references-column-width reflist-lower-alpha"> <ol class="references"> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text">This article follows the customary Wikipedia style detailed at <a href="/wiki/Manual_of_Style/Dates_and_numbers#Julian_and_Gregorian_calendars" class="mw-redirect" title="Manual of Style/Dates and numbers">Manual of Style/Dates and numbers#Julian and Gregorian calendars</a>; dates before 15 October 1582 are given in the Julian calendar while more recent dates are given in the Gregorian calendar. Dates before 1 March 8 AD are given in the Julian calendar as observed in Rome; there is an uncertainty of a few days when these early dates are converted to the <a href="/wiki/Proleptic_Julian_calendar" title="Proleptic Julian calendar">proleptic Julian calendar</a>.</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text">The year in the <a href="/wiki/Iranian_calendar" class="mw-redirect" title="Iranian calendar">Iranian calendar</a> begins on <a href="/wiki/Nowruz" title="Nowruz">Nowruz</a>, which means "new day".</span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text">This is possible because <a href="/wiki/Atmospheric_refraction" title="Atmospheric refraction">atmospheric refraction</a> "lofts" the Sun's apparent disk above its true position in the sky.</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">Here, "day" refers to when the Sun is above the horizon.</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">Prior to the 1980s there was no generally accepted term for the phenomenon, and the word "equilux" was more commonly used as a synonym for <a href="https://en.wiktionary.org/wiki/isophot" class="extiw" title="wiktionary:isophot">isophot</a>.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> The newer meaning of "equilux" is modern (c. 1985 to 1986), and not usually intended: Technical references since the beginning of the 20th century (c. 1910) have used the terms "equilux" and "isophot" interchangeably to mean "of equal illumination" in the context of curves showing how intensely lighting equipment will illuminate a surface. See for instance Walsh (1947).<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> The earliest confirmed use of the modern meaning was in a post on the <a href="/wiki/Usenet" title="Usenet">Usenet</a> group net.astro,<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> which refers to "discussion last year exploring the reasons why equilux and equinox are not coincident". Use of this particular pseudo-Latin <a href="/wiki/Protologism" title="Protologism">protologism</a> can only be traced to an extremely small (less than six) number of predominantly U.S. American people in such online media for the next 20 years until its broader adoption as a <a href="/wiki/Neologism" title="Neologism">neologism</a> (c. 2006), and then its subsequent use by more mainstream organisations (c. 2012).<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup></span> </li> </ol></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=Equinox&action=edit&section=13" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-USNO-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-USNO_1-0">^</a></b></span> <span class="reference-text"><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><cite id="CITEREFAstronomical_Applications_Department_of_USNO" class="citation web cs1">Astronomical Applications Department of <a href="/wiki/USNO" class="mw-redirect" title="USNO">USNO</a>. <a rel="nofollow" class="external text" href="https://aa.usno.navy.mil/data/Earth_Seasons">"Earth's Seasons - Equinoxes, Solstices, Perihelion, and Aphelion"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">1 August</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Earth%27s+Seasons+-+Equinoxes%2C+Solstices%2C+Perihelion%2C+and+Aphelion&rft.au=Astronomical+Applications+Department+of+USNO&rft_id=https%3A%2F%2Faa.usno.navy.mil%2Fdata%2FEarth_Seasons&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></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://www.astropixels.com/ephemeris/soleq2001.html">"Solstices and Equinoxes: 2001 to 2100"</a>. <i>AstroPixels.com</i>. 20 February 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">21 December</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=AstroPixels.com&rft.atitle=Solstices+and+Equinoxes%3A+2001+to+2100&rft.date=2018-02-20&rft_id=http%3A%2F%2Fwww.astropixels.com%2Fephemeris%2Fsoleq2001.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" 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"><a rel="nofollow" class="external text" href="http://www.imcce.fr/newsletter/docs/Equinoxe_printemps_1583_2999.pdf">Équinoxe de printemps entre 1583 et 2999</a></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"><a rel="nofollow" class="external text" href="http://www.imcce.fr/newsletter/docs/Solstice_ete_1583_2999.pdf">Solstice d’été de 1583 à 2999</a></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"><a rel="nofollow" class="external text" href="http://www.imcce.fr/newsletter/docs/Equinoxe_automne_1583_2999.pdf">Équinoxe d’automne de 1583 à 2999</a></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.imcce.fr/newsletter/docs/Solstice_hiver_1583_2999.pdf">Solstice d’hiver</a></span> </li> <li id="cite_note-USNO_FAQ-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-USNO_FAQ_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-USNO_FAQ_8-1"><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://aa.usno.navy.mil/faq/docs/equinoxes.php">"Equinoxes"</a>. <i>Astronomical Information Center</i>. <a href="/wiki/United_States_Naval_Observatory" title="United States Naval Observatory">United States Naval Observatory</a>. 14 June 2019. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20190821111011/https://aa.usno.navy.mil/faq/docs/equinoxes.php">Archived</a> from the original on 21 August 2019<span class="reference-accessdate">. Retrieved <span class="nowrap">9 July</span> 2019</span>. <q>On the day of an equinox, the geometric center of the Sun's disk crosses the equator, and this point is above the horizon for 12 hours everywhere on the Earth. However, the Sun is not simply a geometric point. Sunrise is defined as the instant when the leading edge of the Sun's disk becomes visible on the horizon, whereas sunset is the instant when the trailing edge of the disk disappears below the horizon. These are the moments of first and last direct sunlight. At these times the center of the disk is below the horizon. Furthermore, atmospheric refraction causes the Sun's disk to appear higher in the sky than it would if the Earth had no atmosphere. Thus, in the morning the upper edge of the disk is visible for several minutes before the geometric edge of the disk reaches the horizon. Similarly, in the evening the upper edge of the disk disappears several minutes after the geometric disk has passed below the horizon. The times of sunrise and sunset in almanacs are calculated for the normal atmospheric refraction of 34 minutes of arc and a <a href="/wiki/Semidiameter" title="Semidiameter">semidiameter</a> of 16 minutes of arc for the disk. Therefore, at the tabulated time the geometric center of the Sun is actually 50 minutes of arc below a regular and unobstructed horizon for an observer on the surface of the Earth in a level region</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Astronomical+Information+Center&rft.atitle=Equinoxes&rft.date=2019-06-14&rft_id=https%3A%2F%2Faa.usno.navy.mil%2Ffaq%2Fdocs%2Fequinoxes.php&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</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.esrl.noaa.gov/gmd/grad/solcalc/glossary.html#equinox">"ESRL Global Monitoring Division - Global Radiation Group"</a>. <a href="/wiki/NOAA" class="mw-redirect" title="NOAA">NOAA</a>. <i>www.esrl.noaa.gov</i>. U.S. Department of Commerce<span class="reference-accessdate">. Retrieved <span class="nowrap">9 July</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=www.esrl.noaa.gov&rft.atitle=ESRL+Global+Monitoring+Division+-+Global+Radiation+Group&rft_id=https%3A%2F%2Fwww.esrl.noaa.gov%2Fgmd%2Fgrad%2Fsolcalc%2Fglossary.html%23equinox&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><i>Astronomical Almanac</i>. <a href="/wiki/United_States_Naval_Observatory" title="United States Naval Observatory">United States Naval Observatory</a>. 2008. Glossary.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Astronomical+Almanac&rft.pages=Glossary&rft.pub=United+States+Naval+Observatory&rft.date=2008&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" 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 id="CITEREFGrieser2014" class="citation news cs1">Grieser, Justin (22 September 2014). <a rel="nofollow" class="external text" href="https://www.washingtonpost.com/news/capital-weather-gang/wp/2014/09/22/autumn-arrives-the-fall-equinox-explained-in-six-images/">"Autumn arrives: The fall equinox explained in six images"</a>. <i><a href="/wiki/The_Washington_Post" title="The Washington Post">The Washington Post</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210608185723/https://www.washingtonpost.com/news/capital-weather-gang/wp/2014/09/22/autumn-arrives-the-fall-equinox-explained-in-six-images/">Archived</a> from the original on 8 June 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">29 June</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Washington+Post&rft.atitle=Autumn+arrives%3A+The+fall+equinox+explained+in+six+images&rft.date=2014-09-22&rft.aulast=Grieser&rft.aufirst=Justin&rft_id=https%3A%2F%2Fwww.washingtonpost.com%2Fnews%2Fcapital-weather-gang%2Fwp%2F2014%2F09%2F22%2Fautumn-arrives-the-fall-equinox-explained-in-six-images%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPlait2023" class="citation news cs1">Plait, Phil (22 September 2023). <a rel="nofollow" class="external text" href="https://www.scientificamerican.com/article/the-equinox-is-not-what-you-think-it-is/">"The Equinox Is Not What You Think It Is"</a>. <i><a href="/wiki/Scientific_American" title="Scientific American">Scientific American</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">29 June</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Scientific+American&rft.atitle=The+Equinox+Is+Not+What+You+Think+It+Is&rft.date=2023-09-22&rft.aulast=Plait&rft.aufirst=Phil&rft_id=https%3A%2F%2Fwww.scientificamerican.com%2Farticle%2Fthe-equinox-is-not-what-you-think-it-is%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-YallopEtAl-13"><span class="mw-cite-backlink">^ <a href="#cite_ref-YallopEtAl_13-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-YallopEtAl_13-1"><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="CITEREFYallopHohenkerkBell2013" class="citation book cs1">Yallop, B.D.; Hohenkerk, C.Y.; Bell, S.A. (2013). "Astronomical Phenomena". In Urban, S.E.; Seidelmann, P. K. (eds.). <i>Explanatory supplement to the astronomical almanac</i> (3rd ed.). Mill Valley, CA: University Science Books. pp. 506–507. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-891389-85-6" title="Special:BookSources/978-1-891389-85-6"><bdi>978-1-891389-85-6</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Astronomical+Phenomena&rft.btitle=Explanatory+supplement+to+the+astronomical+almanac&rft.place=Mill+Valley%2C+CA&rft.pages=506-507&rft.edition=3rd&rft.pub=University+Science+Books&rft.date=2013&rft.isbn=978-1-891389-85-6&rft.aulast=Yallop&rft.aufirst=B.D.&rft.au=Hohenkerk%2C+C.Y.&rft.au=Bell%2C+S.A.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</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.timeanddate.com/calendar/march-equinox.html">"March Equinox – Equal Day and Night, Nearly"</a>. <i>Time and Date</i>. 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">22 May</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Time+and+Date&rft.atitle=March+Equinox+%E2%80%93+Equal+Day+and+Night%2C+Nearly&rft.date=2017&rft_id=https%3A%2F%2Fwww.timeanddate.com%2Fcalendar%2Fmarch-equinox.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" 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">Freeth, T., Bitsakis, Y., Moussas, X., Seiradakis, J. H., Tselikas, A., Mangou, H., ... & Allen, M. (2006). Decoding the ancient Greek astronomical calculator known as the Antikythera Mechanism. <i>Nature</i>, <i>444</i>(7119), 587-591.</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"><a rel="nofollow" class="external text" href="https://www.timeanddate.com/sun/@90,0">Sunrise and sunset times in 90°00'N, 0°00'E (North Pole)</a>, timeanddate.com</span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.timeanddate.com/sun/@-90,0">Sunrise and sunset times in 90°00'S, 0°00'E (South Pole)</a>, timeanddate.com</span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBlackburnHolford-Strevens1999" class="citation book cs1">Blackburn, Bonnie J.; Holford-Strevens, Leofranc (1999). <i>The Oxford companion to the year</i>. Oxford University Press. p. 135. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-19-214231-3" title="Special:BookSources/0-19-214231-3"><bdi>0-19-214231-3</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Oxford+companion+to+the+year&rft.pages=135&rft.pub=Oxford+University+Press&rft.date=1999&rft.isbn=0-19-214231-3&rft.aulast=Blackburn&rft.aufirst=Bonnie+J.&rft.au=Holford-Strevens%2C+Leofranc&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span> Reprinted with corrections 2003.</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 id="CITEREFRichards1998" class="citation book cs1">Richards, E. G. (1998). <i>Mapping Time: The Calendar and its History</i>. Oxford University Press. pp. 250–251. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0192862051" title="Special:BookSources/978-0192862051"><bdi>978-0192862051</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Mapping+Time%3A+The+Calendar+and+its+History&rft.pages=250-251&rft.pub=Oxford+University+Press&rft.date=1998&rft.isbn=978-0192862051&rft.aulast=Richards&rft.aufirst=E.+G.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-Skye2007-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-Skye2007_22-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSkye2007" class="citation book cs1">Skye, Michelle (2007). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=s1x2ATL66UcC&pg=PT69"><i>Goddess Alive!: Inviting Celtic & Norse Goddesses Into Your Life</i></a>. Llewellyn Worldwide. pp. 69ff. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7387-1080-8" title="Special:BookSources/978-0-7387-1080-8"><bdi>978-0-7387-1080-8</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Goddess+Alive%21%3A+Inviting+Celtic+%26+Norse+Goddesses+Into+Your+Life&rft.pages=69ff&rft.pub=Llewellyn+Worldwide&rft.date=2007&rft.isbn=978-0-7387-1080-8&rft.aulast=Skye&rft.aufirst=Michelle&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3Ds1x2ATL66UcC%26pg%3DPT69&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-Curtis2013-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-Curtis2013_23-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFCurtis2013" class="citation book cs1">Curtis, Howard D. 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Butterworth-Heinemann. pp. 188ff. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-08-097748-5" title="Special:BookSources/978-0-08-097748-5"><bdi>978-0-08-097748-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Orbital+Mechanics+for+Engineering+Students&rft.pages=188ff&rft.pub=Butterworth-Heinemann&rft.date=2013&rft.isbn=978-0-08-097748-5&rft.aulast=Curtis&rft.aufirst=Howard+D.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D2U9Z8k0TlTYC%26pg%3DPA188&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-GrewalWeill2007-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-GrewalWeill2007_24-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGrewalWeillAndrews2007" class="citation book cs1">Grewal, Mohinder S.; Weill, Lawrence R.; Andrews, Angus P. 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John Wiley & Sons. pp. 459ff. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-470-09971-1" title="Special:BookSources/978-0-470-09971-1"><bdi>978-0-470-09971-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Global+Positioning+Systems%2C+Inertial+Navigation%2C+and+Integration&rft.pages=459ff&rft.pub=John+Wiley+%26+Sons&rft.date=2007&rft.isbn=978-0-470-09971-1&rft.aulast=Grewal&rft.aufirst=Mohinder+S.&rft.au=Weill%2C+Lawrence+R.&rft.au=Andrews%2C+Angus+P.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D6P7UNphJ1z8C%26pg%3DPA459&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></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 id="CITEREFBowditch2002" class="citation book cs1">Bowditch, Nathaniel (2002). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=pXjHDnIE_ygC&pg=PA229"><i>The American practical navigator: An epitome of navigation</i></a>. 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U.K. Meteorological Office.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Equinox+and+Solstice&rft.pub=U.K.+Meteorological+Office&rft_id=https%3A%2F%2Fwww.metoffice.gov.uk%2Fweather%2Flearn-about%2Fweather%2Fseasons%2Fequinox-and-solstice&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-42"><span class="mw-cite-backlink"><b><a href="#cite_ref-42">^</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://earthsky.org/astronomy-essentials/equal-day-and-night-on-the-equinox-march/">"On the equinox, are day and night equal?"</a>. <i>earthsky.org</i>. 19 March 2024<span class="reference-accessdate">. Retrieved <span class="nowrap">23 June</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=earthsky.org&rft.atitle=On+the+equinox%2C+are+day+and+night+equal%3F&rft.date=2024-03-19&rft_id=https%3A%2F%2Fearthsky.org%2Fastronomy-essentials%2Fequal-day-and-night-on-the-equinox-march%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-43"><span class="mw-cite-backlink"><b><a href="#cite_ref-43">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDavis1992" class="citation book cs1">Davis, Neil (1992). <i>The Aurora Watcher's Handbook</i>. University of Alaska Press. pp. 117–124. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-912006-60-9" title="Special:BookSources/0-912006-60-9"><bdi>0-912006-60-9</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Aurora+Watcher%27s+Handbook&rft.pages=117-124&rft.pub=University+of+Alaska+Press&rft.date=1992&rft.isbn=0-912006-60-9&rft.aulast=Davis&rft.aufirst=Neil&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-44"><span class="mw-cite-backlink"><b><a href="#cite_ref-44">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDiBiasio2013" class="citation book cs1">DiBiasio, Jame (15 July 2013). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=fg4LBAAAQBAJ&dq=angkor+equinox&pg=PT37"><i>The Story of Angkor</i></a>. Silkworm Books. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-63102-259-3" title="Special:BookSources/978-1-63102-259-3"><bdi>978-1-63102-259-3</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Story+of+Angkor&rft.pub=Silkworm+Books&rft.date=2013-07-15&rft.isbn=978-1-63102-259-3&rft.aulast=DiBiasio&rft.aufirst=Jame&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3Dfg4LBAAAQBAJ%26dq%3Dangkor%2Bequinox%26pg%3DPT37&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-45"><span class="mw-cite-backlink"><b><a href="#cite_ref-45">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJohnson2011" class="citation book cs1">Johnson, Walter (18 November 2011). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=MZQeHSDPe0MC&dq=equinox+as+their+reference+point+for+the+orientation+of+churches.&pg=PA229"><i>Byways in British Archaeology</i></a>. Cambridge University Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-521-22877-0" title="Special:BookSources/978-0-521-22877-0"><bdi>978-0-521-22877-0</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Byways+in+British+Archaeology&rft.pub=Cambridge+University+Press&rft.date=2011-11-18&rft.isbn=978-0-521-22877-0&rft.aulast=Johnson&rft.aufirst=Walter&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DMZQeHSDPe0MC%26dq%3Dequinox%2Bas%2Btheir%2Breference%2Bpoint%2Bfor%2Bthe%2Borientation%2Bof%2Bchurches.%26pg%3DPA229&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-46"><span class="mw-cite-backlink"><b><a href="#cite_ref-46">^</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://www.intelsat.com/tools-resources/library/satellite-101/satellite-sun-interference/">"Satellite Sun Interference"</a>. <i>Intelsat</i><span class="reference-accessdate">. Retrieved <span class="nowrap">20 March</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=Intelsat&rft.atitle=Satellite+Sun+Interference&rft_id=http%3A%2F%2Fwww.intelsat.com%2Ftools-resources%2Flibrary%2Fsatellite-101%2Fsatellite-sun-interference%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-47"><span class="mw-cite-backlink"><b><a href="#cite_ref-47">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAbrahamian2018" class="citation news cs1">Abrahamian, David (17 April 2018). <a rel="nofollow" class="external text" href="https://news.viasat.com/blog/scn/how-satellites-are-affected-by-the-spring-and-autumn-equinoxes/">"How satellites are affected by the spring and autumn equinoxes"</a>. <i><a href="/wiki/Viasat_(American_company)" title="Viasat (American company)">Viasat, Inc</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">20 March</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Viasat%2C+Inc&rft.atitle=How+satellites+are+affected+by+the+spring+and+autumn+equinoxes&rft.date=2018-04-17&rft.aulast=Abrahamian&rft.aufirst=David&rft_id=https%3A%2F%2Fnews.viasat.com%2Fblog%2Fscn%2Fhow-satellites-are-affected-by-the-spring-and-autumn-equinoxes%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-48"><span class="mw-cite-backlink"><b><a href="#cite_ref-48">^</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://photojournal.jpl.nasa.gov/catalog/PIA11667">"PIA11667: The Rite of Spring"</a>. Jet Propulsion Laboratory, California Institute of Technology<span class="reference-accessdate">. Retrieved <span class="nowrap">21 March</span> 2014</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=PIA11667%3A+The+Rite+of+Spring&rft.pub=Jet+Propulsion+Laboratory%2C+California+Institute+of+Technology&rft_id=http%3A%2F%2Fphotojournal.jpl.nasa.gov%2Fcatalog%2FPIA11667&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-49"><span class="mw-cite-backlink"><b><a href="#cite_ref-49">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLakdawalla2016" class="citation web cs1"><a href="/wiki/Emily_Lakdawalla" title="Emily Lakdawalla">Lakdawalla, Emily</a> (7 July 2016). <a rel="nofollow" class="external text" href="http://www.planetary.org/blogs/emily-lakdawalla/2016/06031044-oppositions-conjunctions-rpx.html">"Oppositions, conjunctions, seasons, and ring plane crossings of the giant planets"</a>. <i><a href="/wiki/The_Planetary_Society" title="The Planetary Society">The Planetary Society</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">31 January</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+Planetary+Society&rft.atitle=Oppositions%2C+conjunctions%2C+seasons%2C+and+ring+plane+crossings+of+the+giant+planets&rft.date=2016-07-07&rft.aulast=Lakdawalla&rft.aufirst=Emily&rft_id=http%3A%2F%2Fwww.planetary.org%2Fblogs%2Femily-lakdawalla%2F2016%2F06031044-oppositions-conjunctions-rpx.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></span> </li> <li id="cite_note-50"><span class="mw-cite-backlink"><b><a href="#cite_ref-50">^</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://www.planetary.org/explore/space-topics/mars/mars-calendar.html">"Mars Calendar"</a>. <a href="/wiki/The_Planetary_Society" title="The Planetary Society">The Planetary Society</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Mars+Calendar&rft.pub=The+Planetary+Society&rft_id=http%3A%2F%2Fwww.planetary.org%2Fexplore%2Fspace-topics%2Fmars%2Fmars-calendar.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" 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=Equinox&action=edit&section=14" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output 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height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/51px-Wikiquote-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/68px-Wikiquote-logo.svg.png 2x" data-file-width="300" data-file-height="355" /></span></span></div> <div class="side-box-text plainlist">Wikiquote has quotations related to <i><b><a href="https://en.wikiquote.org/wiki/Special:Search/Equinox" class="extiw" title="q:Special:Search/Equinox">Equinox</a></b></i>.</div></div> </div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.timeanddate.com/worldclock/sunearth.html?iso=20150923T0820">"Day and Night World Map (night and day map on equinox)"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Day+and+Night+World+Map+%28night+and+day+map+on+equinox%29&rft_id=http%3A%2F%2Fwww.timeanddate.com%2Fworldclock%2Fsunearth.html%3Fiso%3D20150923T0820&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.gandraxa.com/length_of_day.xml">"Calculation of Length of Day (Formulas and Graphs)"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Calculation+of+Length+of+Day+%28Formulas+and+Graphs%29&rft_id=http%3A%2F%2Fwww.gandraxa.com%2Flength_of_day.xml&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.gutenberg.org/dirs/1/2/3/4/12342/12342-h/12342-h.htm#E">"Equinoctial Points"</a>. <i><a href="/wiki/The_Nuttall_Encyclop%C3%A6dia" title="The Nuttall Encyclopædia">The Nuttall Encyclopædia</a></i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+Nuttall+Encyclop%C3%A6dia&rft.atitle=Equinoctial+Points&rft_id=http%3A%2F%2Fwww.gutenberg.org%2Fdirs%2F1%2F2%2F3%2F4%2F12342%2F12342-h%2F12342-h.htm%23E&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://nshdpi.ca/is/equinox/eqindex.html">"Table of times of spring Equinox for a thousand years: 1452–2547"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Table+of+times+of+spring+Equinox+for+a+thousand+years%3A+1452%E2%80%932547&rft_id=http%3A%2F%2Fnshdpi.ca%2Fis%2Fequinox%2Feqindex.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGrayMerrifield,_Michael" class="citation web cs1">Gray, Meghan; Merrifield, Michael. <a href="/wiki/Brady_Haran" title="Brady Haran">Haran, Brady</a> (ed.). <a rel="nofollow" class="external text" href="http://www.sixtysymbols.com/videos/solstice.htm">"Solstice and Equinox"</a>. <i>Sixty Symbols</i>. <a href="/wiki/University_of_Nottingham" title="University of Nottingham">University of Nottingham</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Sixty+Symbols&rft.atitle=Solstice+and+Equinox&rft.aulast=Gray&rft.aufirst=Meghan&rft.au=Merrifield%2C+Michael&rft_id=http%3A%2F%2Fwww.sixtysymbols.com%2Fvideos%2Fsolstice.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEquinox" class="Z3988"></span></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output 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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 class="mw-selflink selflink">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 href="/wiki/Day" title="Day">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" 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