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accesskey="z"><span>Etusivu</span></a></li><li id="n-aboutsite" class="mw-list-item"><a href="/wiki/Wikipedia:Tietoja"><span>Tietoja Wikipediasta</span></a></li><li id="n-allarticles" class="mw-list-item"><a href="/wiki/Wikipedia:Selaa_luokittain"><span>Kaikki sivut</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Toiminnot:Satunnainen_sivu" title="Avaa satunnainen sivu [x]" accesskey="x"><span>Satunnainen artikkeli</span></a></li><li id="n-specialpages" class="mw-list-item"><a href="/wiki/Toiminnot:Toimintosivut"><span>Toimintosivut</span></a></li> </ul> </div> </div> <div id="p-interaction" class="vector-menu mw-portlet mw-portlet-interaction" > <div class="vector-menu-heading"> Osallistuminen </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/Ohje:Sis%C3%A4llys" title="Ohjeita"><span>Ohje</span></a></li><li id="n-Kahvihuone" class="mw-list-item"><a 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href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=fi.wikipedia.org&uselang=fi" class=""><span>Lahjoitukset</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Toiminnot:Luo_tunnus&returnto=Sekunti" title="On suositeltavaa luoda käyttäjätunnus ja kirjautua sisään. Se ei kuitenkaan ole pakollista." class=""><span>Luo tunnus</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Toiminnot:Kirjaudu_sis%C3%A4%C3%A4n&returnto=Sekunti" title="On suositeltavaa kirjautua sisään. Se ei kuitenkaan ole pakollista. 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Se ei kuitenkaan ole pakollista."><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Luo tunnus</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Toiminnot:Kirjaudu_sis%C3%A4%C3%A4n&returnto=Sekunti" title="On suositeltavaa kirjautua sisään. Se ei kuitenkaan ole pakollista. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Kirjaudu sisään</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Sivut kirjautumattomille muokkaajille <a href="/wiki/Wikipedia:Tervetuloa_Wikipediaan" aria-label="Lue lisää muokkaamisesta"><span>lue lisää</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Toiminnot:Omat_muokkaukset" title="Luettelo tästä IP-osoitteesta tehdyistä muokkauksista [y]" accesskey="y"><span>Muokkaukset</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Toiminnot:Oma_keskustelu" title="Keskustelu tämän IP-osoitteen muokkauksista [n]" accesskey="n"><span>Keskustelu</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Sivusto"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Sisällysluettelo" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Sisällysluettelo</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">siirrä sivupalkkiin</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">piilota</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">Johdanto</div> </a> </li> <li id="toc-Määritelmä" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Määritelmä"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Määritelmä</span> </div> </a> <ul id="toc-Määritelmä-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Historia" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Historia"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Historia</span> </div> </a> <ul id="toc-Historia-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Karkaussekunnit" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Karkaussekunnit"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Karkaussekunnit</span> </div> </a> <ul id="toc-Karkaussekunnit-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-SI-kertoimet" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#SI-kertoimet"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>SI-kertoimet</span> </div> </a> <ul id="toc-SI-kertoimet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Lähteet" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Lähteet"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Lähteet</span> </div> </a> <button aria-controls="toc-Lähteet-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>Vaihda alaosio Lähteet</span> </button> <ul id="toc-Lähteet-sublist" class="vector-toc-list"> <li id="toc-Viitteet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Viitteet"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Viitteet</span> </div> </a> <ul id="toc-Viitteet-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Aiheesta_muualla" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Aiheesta_muualla"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Aiheesta muualla</span> </div> </a> <ul id="toc-Aiheesta_muualla-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="Sisällysluettelo" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Sisällysluettelo" > <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="Vaihda sisällysluettelo" > <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">Vaihda sisällysluettelo</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">Sekunti</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="Mene artikkeliin toisella kielellä. Saatavilla 160 kielellä" > <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-160" 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">160 kieltä</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/Sekonde" title="Sekonde — afrikaans" lang="af" hreflang="af" data-title="Sekonde" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-als mw-list-item"><a href="https://als.wikipedia.org/wiki/Sekunde" title="Sekunde — sveitsinsaksa" lang="gsw" hreflang="gsw" data-title="Sekunde" data-language-autonym="Alemannisch" data-language-local-name="sveitsinsaksa" class="interlanguage-link-target"><span>Alemannisch</span></a></li><li class="interlanguage-link interwiki-am mw-list-item"><a href="https://am.wikipedia.org/wiki/%E1%88%B4%E1%8A%AE%E1%8A%95%E1%8B%B5" title="ሴኮንድ — amhara" lang="am" hreflang="am" data-title="ሴኮንድ" data-language-autonym="አማርኛ" data-language-local-name="amhara" class="interlanguage-link-target"><span>አማርኛ</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AB%D8%A7%D9%86%D9%8A%D8%A9" title="ثانية — arabia" lang="ar" hreflang="ar" data-title="ثانية" data-language-autonym="العربية" data-language-local-name="arabia" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Segundo" title="Segundo — aragonia" lang="an" hreflang="an" data-title="Segundo" data-language-autonym="Aragonés" data-language-local-name="aragonia" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-arc mw-list-item"><a href="https://arc.wikipedia.org/wiki/%DC%AA%DC%A6%DC%A6%DC%90" title="ܪܦܦܐ — valtakunnanaramea" lang="arc" hreflang="arc" data-title="ܪܦܦܐ" data-language-autonym="ܐܪܡܝܐ" data-language-local-name="valtakunnanaramea" class="interlanguage-link-target"><span>ܐܪܡܝܐ</span></a></li><li class="interlanguage-link interwiki-hyw mw-list-item"><a href="https://hyw.wikipedia.org/wiki/%D4%B5%D6%80%D5%AF%D5%BE%D5%A1%D5%B5%D6%80%D5%AF%D5%A5%D5%A1%D5%B6" title="Երկվայրկեան — Western Armenian" lang="hyw" hreflang="hyw" data-title="Երկվայրկեան" data-language-autonym="Արեւմտահայերէն" data-language-local-name="Western Armenian" class="interlanguage-link-target"><span>Արեւմտահայերէն</span></a></li><li class="interlanguage-link interwiki-as mw-list-item"><a href="https://as.wikipedia.org/wiki/%E0%A6%9B%E0%A7%87%E0%A6%95%E0%A7%87%E0%A6%A3%E0%A7%8D%E0%A6%A1" title="ছেকেণ্ড — assami" lang="as" hreflang="as" data-title="ছেকেণ্ড" data-language-autonym="অসমীয়া" data-language-local-name="assami" class="interlanguage-link-target"><span>অসমীয়া</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Segundu" title="Segundu — asturia" lang="ast" hreflang="ast" data-title="Segundu" data-language-autonym="Asturianu" data-language-local-name="asturia" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-gn mw-list-item"><a href="https://gn.wikipedia.org/wiki/Aravo%27ive" title="Aravo'ive — guarani" lang="gn" hreflang="gn" data-title="Aravo'ive" data-language-autonym="Avañe'ẽ" data-language-local-name="guarani" class="interlanguage-link-target"><span>Avañe'ẽ</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Saniy%C9%99" title="Saniyə — azeri" lang="az" hreflang="az" data-title="Saniyə" data-language-autonym="Azərbaycanca" data-language-local-name="azeri" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%AB%D8%A7%D9%86%DB%8C%D9%87" title="ثانیه — South Azerbaijani" lang="azb" hreflang="azb" data-title="ثانیه" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Detik" title="Detik — indonesia" lang="id" hreflang="id" data-title="Detik" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesia" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Saat" title="Saat — malaiji" lang="ms" hreflang="ms" data-title="Saat" data-language-autonym="Bahasa Melayu" data-language-local-name="malaiji" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-ban mw-list-item"><a href="https://ban.wikipedia.org/wiki/Detik" title="Detik — bali" lang="ban" hreflang="ban" data-title="Detik" data-language-autonym="Basa Bali" data-language-local-name="bali" class="interlanguage-link-target"><span>Basa Bali</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A7%87%E0%A6%95%E0%A7%87%E0%A6%A8%E0%A7%8D%E0%A6%A1" title="সেকেন্ড — bengali" lang="bn" hreflang="bn" data-title="সেকেন্ড" data-language-autonym="বাংলা" data-language-local-name="bengali" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/Bi%C3%B3" title="Bió — min nan -kiina" lang="nan" hreflang="nan" data-title="Bió" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="min nan -kiina" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-ba mw-list-item"><a href="https://ba.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4" title="Секунд — baškiiri" lang="ba" hreflang="ba" data-title="Секунд" data-language-autonym="Башҡортса" data-language-local-name="baškiiri" class="interlanguage-link-target"><span>Башҡортса</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — valkovenäjä" lang="be" hreflang="be" data-title="Секунда" data-language-autonym="Беларуская" data-language-local-name="valkovenäjä" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A1%D1%8D%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Сэкунда — Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Сэкунда" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Segundo" title="Segundo — Central Bikol" lang="bcl" hreflang="bcl" data-title="Segundo" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target"><span>Bikol Central</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Sekund" title="Sekund — baijeri" lang="bar" hreflang="bar" data-title="Sekund" data-language-autonym="Boarisch" data-language-local-name="baijeri" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-bo mw-list-item"><a href="https://bo.wikipedia.org/wiki/%E0%BD%A6%E0%BE%90%E0%BD%A2%E0%BC%8B%E0%BD%86%E0%BC%8D" title="སྐར་ཆ། — tiibet" lang="bo" hreflang="bo" data-title="སྐར་ཆ།" data-language-autonym="བོད་ཡིག" data-language-local-name="tiibet" class="interlanguage-link-target"><span>བོད་ཡིག</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Sekunda" title="Sekunda — bosnia" lang="bs" hreflang="bs" data-title="Sekunda" data-language-autonym="Bosanski" data-language-local-name="bosnia" 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/Eilenn_(amzer)" title="Eilenn (amzer) — bretoni" lang="br" hreflang="br" data-title="Eilenn (amzer)" data-language-autonym="Brezhoneg" data-language-local-name="bretoni" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — bulgaria" lang="bg" hreflang="bg" data-title="Секунда" data-language-autonym="Български" data-language-local-name="bulgaria" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Segon" title="Segon — katalaani" lang="ca" hreflang="ca" data-title="Segon" data-language-autonym="Català" data-language-local-name="katalaani" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%C3%87%D0%B5%D0%BA%D0%BA%D1%83%D0%BD%D1%82" title="Çеккунт — tšuvassi" lang="cv" hreflang="cv" data-title="Çеккунт" data-language-autonym="Чӑвашла" data-language-local-name="tšuvassi" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Sekunda" title="Sekunda — tšekki" lang="cs" hreflang="cs" data-title="Sekunda" data-language-autonym="Čeština" data-language-local-name="tšekki" 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/Chepiri" title="Chepiri — šona" lang="sn" hreflang="sn" data-title="Chepiri" data-language-autonym="ChiShona" data-language-local-name="šona" 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/Eiliad" title="Eiliad — kymri" lang="cy" hreflang="cy" data-title="Eiliad" data-language-autonym="Cymraeg" data-language-local-name="kymri" 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/Sekund" title="Sekund — tanska" lang="da" hreflang="da" data-title="Sekund" data-language-autonym="Dansk" data-language-local-name="tanska" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-ary mw-list-item"><a href="https://ary.wikipedia.org/wiki/%D8%AA%D8%A7%D9%86%D9%8A%D8%A9" title="تانية — marokonarabia" lang="ary" hreflang="ary" data-title="تانية" data-language-autonym="الدارجة" data-language-local-name="marokonarabia" class="interlanguage-link-target"><span>الدارجة</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Sekunde" title="Sekunde — saksa" lang="de" hreflang="de" data-title="Sekunde" data-language-autonym="Deutsch" data-language-local-name="saksa" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Sekund" title="Sekund — viro" lang="et" hreflang="et" data-title="Sekund" data-language-autonym="Eesti" data-language-local-name="viro" 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%94%CE%B5%CF%85%CF%84%CE%B5%CF%81%CF%8C%CE%BB%CE%B5%CF%80%CF%84%CE%BF" title="Δευτερόλεπτο — kreikka" lang="el" hreflang="el" data-title="Δευτερόλεπτο" data-language-autonym="Ελληνικά" data-language-local-name="kreikka" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Second" title="Second — englanti" lang="en" hreflang="en" data-title="Second" data-language-autonym="English" data-language-local-name="englanti" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Segundo" title="Segundo — espanja" lang="es" hreflang="es" data-title="Segundo" data-language-autonym="Español" data-language-local-name="espanja" 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/Sekundo" title="Sekundo — esperanto" lang="eo" hreflang="eo" data-title="Sekundo" 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/Segundo" title="Segundo — baski" lang="eu" hreflang="eu" data-title="Segundo" data-language-autonym="Euskara" data-language-local-name="baski" 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%AB%D8%A7%D9%86%DB%8C%D9%87" title="ثانیه — persia" lang="fa" hreflang="fa" data-title="ثانیه" data-language-autonym="فارسی" data-language-local-name="persia" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-hif mw-list-item"><a href="https://hif.wikipedia.org/wiki/Second" title="Second — fidžinhindi" lang="hif" hreflang="hif" data-title="Second" data-language-autonym="Fiji Hindi" data-language-local-name="fidžinhindi" class="interlanguage-link-target"><span>Fiji Hindi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Seconde_(temps)" title="Seconde (temps) — ranska" lang="fr" hreflang="fr" data-title="Seconde (temps)" data-language-autonym="Français" data-language-local-name="ranska" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Sekonde" title="Sekonde — länsifriisi" lang="fy" hreflang="fy" data-title="Sekonde" data-language-autonym="Frysk" data-language-local-name="länsifriisi" class="interlanguage-link-target"><span>Frysk</span></a></li><li class="interlanguage-link interwiki-fur mw-list-item"><a href="https://fur.wikipedia.org/wiki/Secont" title="Secont — friuli" lang="fur" hreflang="fur" data-title="Secont" data-language-autonym="Furlan" data-language-local-name="friuli" class="interlanguage-link-target"><span>Furlan</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Soicind" title="Soicind — iiri" lang="ga" hreflang="ga" data-title="Soicind" data-language-autonym="Gaeilge" data-language-local-name="iiri" 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/Segundo" title="Segundo — galicia" lang="gl" hreflang="gl" data-title="Segundo" data-language-autonym="Galego" data-language-local-name="galicia" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gan mw-list-item"><a href="https://gan.wikipedia.org/wiki/%E7%A7%92" title="秒 — gan-kiina" lang="gan" hreflang="gan" data-title="秒" data-language-autonym="贛語" data-language-local-name="gan-kiina" class="interlanguage-link-target"><span>贛語</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%B8%E0%AB%87%E0%AA%95%E0%AA%A8%E0%AB%8D%E0%AA%A1" title="સેકન્ડ — gudžarati" lang="gu" hreflang="gu" data-title="સેકન્ડ" data-language-autonym="ગુજરાતી" data-language-local-name="gudžarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-hak mw-list-item"><a href="https://hak.wikipedia.org/wiki/Mi%C3%A9u" title="Miéu — hakka-kiina" lang="hak" hreflang="hak" data-title="Miéu" data-language-autonym="客家語 / Hak-kâ-ngî" data-language-local-name="hakka-kiina" class="interlanguage-link-target"><span>客家語 / Hak-kâ-ngî</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%B4%88_(%EC%8B%9C%EA%B0%84)" title="초 (시간) — korea" lang="ko" hreflang="ko" data-title="초 (시간)" data-language-autonym="한국어" data-language-local-name="korea" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/Sakan" title="Sakan — hausa" lang="ha" hreflang="ha" data-title="Sakan" data-language-autonym="Hausa" data-language-local-name="hausa" class="interlanguage-link-target"><span>Hausa</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8E%D5%A1%D5%B5%D6%80%D5%AF%D5%B5%D5%A1%D5%B6" title="Վայրկյան — armenia" lang="hy" hreflang="hy" data-title="Վայրկյան" data-language-autonym="Հայերեն" data-language-local-name="armenia" 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%B8%E0%A5%87%E0%A4%95%E0%A5%87%E0%A4%82%E0%A4%A1" title="सेकेंड — hindi" lang="hi" hreflang="hi" data-title="सेकेंड" 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/Sekunda" title="Sekunda — kroatia" lang="hr" hreflang="hr" data-title="Sekunda" data-language-autonym="Hrvatski" data-language-local-name="kroatia" 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/Sekundo" title="Sekundo — ido" lang="io" hreflang="io" data-title="Sekundo" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-ilo mw-list-item"><a href="https://ilo.wikipedia.org/wiki/Segundo" title="Segundo — iloko" lang="ilo" hreflang="ilo" data-title="Segundo" data-language-autonym="Ilokano" data-language-local-name="iloko" class="interlanguage-link-target"><span>Ilokano</span></a></li><li class="interlanguage-link interwiki-ia mw-list-item"><a href="https://ia.wikipedia.org/wiki/Secunda" title="Secunda — interlingua" lang="ia" hreflang="ia" data-title="Secunda" data-language-autonym="Interlingua" data-language-local-name="interlingua" class="interlanguage-link-target"><span>Interlingua</span></a></li><li class="interlanguage-link interwiki-ie mw-list-item"><a href="https://ie.wikipedia.org/wiki/Seconde" title="Seconde — interlingue" lang="ie" hreflang="ie" data-title="Seconde" data-language-autonym="Interlingue" data-language-local-name="interlingue" class="interlanguage-link-target"><span>Interlingue</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Sek%C3%BAnda" title="Sekúnda — islanti" lang="is" hreflang="is" data-title="Sekúnda" data-language-autonym="Íslenska" data-language-local-name="islanti" 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/Secondo" title="Secondo — italia" lang="it" hreflang="it" data-title="Secondo" data-language-autonym="Italiano" data-language-local-name="italia" 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%A9%D7%A0%D7%99%D7%99%D7%94" title="שנייה — heprea" lang="he" hreflang="he" data-title="שנייה" data-language-autonym="עברית" data-language-local-name="heprea" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-jv mw-list-item"><a href="https://jv.wikipedia.org/wiki/Detik" title="Detik — jaava" lang="jv" hreflang="jv" data-title="Detik" data-language-autonym="Jawa" data-language-local-name="jaava" class="interlanguage-link-target"><span>Jawa</span></a></li><li class="interlanguage-link interwiki-kbp mw-list-item"><a href="https://kbp.wikipedia.org/wiki/K%C9%9Bl%C9%9Bmk%C9%9Bl%C9%9Bm" title="Kɛlɛmkɛlɛm — Kabiye" lang="kbp" hreflang="kbp" data-title="Kɛlɛmkɛlɛm" data-language-autonym="Kabɩyɛ" data-language-local-name="Kabiye" class="interlanguage-link-target"><span>Kabɩyɛ</span></a></li><li class="interlanguage-link interwiki-krc mw-list-item"><a href="https://krc.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4" title="Секунд — karatšai-balkaari" lang="krc" hreflang="krc" data-title="Секунд" data-language-autonym="Къарачай-малкъар" data-language-local-name="karatšai-balkaari" class="interlanguage-link-target"><span>Къарачай-малкъар</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%AC%E1%83%90%E1%83%9B%E1%83%98" title="წამი — georgia" lang="ka" hreflang="ka" data-title="წამი" data-language-autonym="ქართული" data-language-local-name="georgia" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ks mw-list-item"><a href="https://ks.wikipedia.org/wiki/%D8%B3%D8%A0%DA%A9%D9%8E%D9%86%D9%9B%DA%88" title="سؠکَنٛڈ — kašmiri" lang="ks" hreflang="ks" data-title="سؠکَنٛڈ" data-language-autonym="कॉशुर / کٲشُر" data-language-local-name="kašmiri" class="interlanguage-link-target"><span>कॉशुर / کٲشُر</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4" title="Секунд — kazakki" lang="kk" hreflang="kk" data-title="Секунд" data-language-autonym="Қазақша" data-language-local-name="kazakki" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-kw mw-list-item"><a href="https://kw.wikipedia.org/wiki/Eylen" title="Eylen — korni" lang="kw" hreflang="kw" data-title="Eylen" data-language-autonym="Kernowek" data-language-local-name="korni" class="interlanguage-link-target"><span>Kernowek</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — kirgiisi" lang="ky" hreflang="ky" data-title="Секунда" data-language-autonym="Кыргызча" data-language-local-name="kirgiisi" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Sekunde" title="Sekunde — swahili" lang="sw" hreflang="sw" data-title="Sekunde" 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/Segond_(tan)" title="Segond (tan) — haiti" lang="ht" hreflang="ht" data-title="Segond (tan)" data-language-autonym="Kreyòl ayisyen" data-language-local-name="haiti" class="interlanguage-link-target"><span>Kreyòl ayisyen</span></a></li><li class="interlanguage-link interwiki-gcr mw-list-item"><a href="https://gcr.wikipedia.org/wiki/S%C3%A9gonn" title="Ségonn — Guianan Creole" lang="gcr" hreflang="gcr" data-title="Ségonn" data-language-autonym="Kriyòl gwiyannen" data-language-local-name="Guianan Creole" class="interlanguage-link-target"><span>Kriyòl gwiyannen</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/San%C3%AE" title="Sanî — kurdi" lang="ku" hreflang="ku" data-title="Sanî" data-language-autonym="Kurdî" data-language-local-name="kurdi" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Secundum" title="Secundum — latina" lang="la" hreflang="la" data-title="Secundum" data-language-autonym="Latina" data-language-local-name="latina" 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/Sekunde" title="Sekunde — latvia" lang="lv" hreflang="lv" data-title="Sekunde" data-language-autonym="Latviešu" data-language-local-name="latvia" 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/Sekonn" title="Sekonn — luxemburg" lang="lb" hreflang="lb" data-title="Sekonn" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxemburg" 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/Sekund%C4%97" title="Sekundė — liettua" lang="lt" hreflang="lt" data-title="Sekundė" data-language-autonym="Lietuvių" data-language-local-name="liettua" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-li mw-list-item"><a href="https://li.wikipedia.org/wiki/Sec%C3%B3nd" title="Secónd — limburg" lang="li" hreflang="li" data-title="Secónd" data-language-autonym="Limburgs" data-language-local-name="limburg" class="interlanguage-link-target"><span>Limburgs</span></a></li><li class="interlanguage-link interwiki-jbo mw-list-item"><a href="https://jbo.wikipedia.org/wiki/snidu" title="snidu — lojban" lang="jbo" hreflang="jbo" data-title="snidu" data-language-autonym="La .lojban." data-language-local-name="lojban" class="interlanguage-link-target"><span>La .lojban.</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Segond" title="Segond — lombardi" lang="lmo" hreflang="lmo" data-title="Segond" data-language-autonym="Lombard" data-language-local-name="lombardi" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/M%C3%A1sodperc" title="Másodperc — unkari" lang="hu" hreflang="hu" data-title="Másodperc" data-language-autonym="Magyar" data-language-local-name="unkari" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mai mw-list-item"><a href="https://mai.wikipedia.org/wiki/%E0%A4%B8%E0%A5%87%E0%A4%95%E0%A5%87%E0%A4%A3%E0%A5%8D%E0%A4%A1" title="सेकेण्ड — maithili" lang="mai" hreflang="mai" data-title="सेकेण्ड" data-language-autonym="मैथिली" data-language-local-name="maithili" class="interlanguage-link-target"><span>मैथिली</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — makedonia" lang="mk" hreflang="mk" data-title="Секунда" data-language-autonym="Македонски" data-language-local-name="makedonia" 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/Segondra" title="Segondra — malagassi" lang="mg" hreflang="mg" data-title="Segondra" data-language-autonym="Malagasy" data-language-local-name="malagassi" 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%9E%E0%B5%8A%E0%B4%9F%E0%B4%BF" title="ഞൊടി — malajalam" lang="ml" hreflang="ml" data-title="ഞൊടി" data-language-autonym="മലയാളം" data-language-local-name="malajalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%B8%E0%A5%87%E0%A4%95%E0%A4%82%E0%A4%A6" title="सेकंद — marathi" lang="mr" hreflang="mr" data-title="सेकंद" data-language-autonym="मराठी" data-language-local-name="marathi" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/%E1%83%9B%E1%83%94%E1%83%A0%E1%83%A5%E1%83%90" title="მერქა — mingreli" lang="xmf" hreflang="xmf" data-title="მერქა" data-language-autonym="მარგალური" data-language-local-name="mingreli" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-arz mw-list-item"><a href="https://arz.wikipedia.org/wiki/%D8%B3%D8%A7%D9%86%D9%8A%D9%87" title="سانيه — egyptinarabia" lang="arz" hreflang="arz" data-title="سانيه" data-language-autonym="مصرى" data-language-local-name="egyptinarabia" class="interlanguage-link-target"><span>مصرى</span></a></li><li class="interlanguage-link interwiki-min mw-list-item"><a href="https://min.wikipedia.org/wiki/Datiak" title="Datiak — minangkabau" lang="min" hreflang="min" data-title="Datiak" data-language-autonym="Minangkabau" data-language-local-name="minangkabau" class="interlanguage-link-target"><span>Minangkabau</span></a></li><li class="interlanguage-link interwiki-cdo mw-list-item"><a href="https://cdo.wikipedia.org/wiki/Mi%C4%93u" title="Miēu — Mindong" lang="cdo" hreflang="cdo" data-title="Miēu" 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-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4" title="Секунд — mongoli" lang="mn" hreflang="mn" data-title="Секунд" data-language-autonym="Монгол" data-language-local-name="mongoli" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wikipedia.org/wiki/%E1%80%85%E1%80%80%E1%80%B9%E1%80%80%E1%80%94%E1%80%B7%E1%80%BA" title="စက္ကန့် — burma" lang="my" hreflang="my" data-title="စက္ကန့်" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="burma" class="interlanguage-link-target"><span>မြန်မာဘာသာ</span></a></li><li class="interlanguage-link interwiki-fj mw-list-item"><a href="https://fj.wikipedia.org/wiki/Sekodi" title="Sekodi — fidži" lang="fj" hreflang="fj" data-title="Sekodi" data-language-autonym="Na Vosa Vakaviti" data-language-local-name="fidži" class="interlanguage-link-target"><span>Na Vosa Vakaviti</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Seconde" title="Seconde — hollanti" lang="nl" hreflang="nl" data-title="Seconde" data-language-autonym="Nederlands" data-language-local-name="hollanti" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%B8%E0%A5%87%E0%A4%95%E0%A5%87%E0%A4%A8%E0%A5%8D%E0%A4%A1" title="सेकेन्ड — nepali" lang="ne" hreflang="ne" data-title="सेकेन्ड" data-language-autonym="नेपाली" data-language-local-name="nepali" class="interlanguage-link-target"><span>नेपाली</span></a></li><li class="interlanguage-link interwiki-ja badge-Q17437798 badge-goodarticle mw-list-item" title="hyvä artikkeli"><a href="https://ja.wikipedia.org/wiki/%E7%A7%92" title="秒 — japani" lang="ja" hreflang="ja" data-title="秒" data-language-autonym="日本語" data-language-local-name="japani" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Sekund" title="Sekund — pohjoisfriisi" lang="frr" hreflang="frr" data-title="Sekund" data-language-autonym="Nordfriisk" data-language-local-name="pohjoisfriisi" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Sekund" title="Sekund — norjan bokmål" lang="nb" hreflang="nb" data-title="Sekund" data-language-autonym="Norsk bokmål" data-language-local-name="norjan bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Sekund" title="Sekund — norjan nynorsk" lang="nn" hreflang="nn" data-title="Sekund" data-language-autonym="Norsk nynorsk" data-language-local-name="norjan nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Segonda" title="Segonda — oksitaani" lang="oc" hreflang="oc" data-title="Segonda" data-language-autonym="Occitan" data-language-local-name="oksitaani" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-om mw-list-item"><a href="https://om.wikipedia.org/wiki/Sekondii" title="Sekondii — oromo" lang="om" hreflang="om" data-title="Sekondii" data-language-autonym="Oromoo" data-language-local-name="oromo" class="interlanguage-link-target"><span>Oromoo</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Soniya" title="Soniya — uzbekki" lang="uz" hreflang="uz" data-title="Soniya" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="uzbekki" 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%95%E0%A8%BF%E0%A9%B0%E0%A8%9F" title="ਸਕਿੰਟ — pandžabi" lang="pa" hreflang="pa" data-title="ਸਕਿੰਟ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="pandžabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%B3%DA%A9%D9%86%D9%B9" title="سکنٹ — Western Punjabi" lang="pnb" hreflang="pnb" data-title="سکنٹ" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-ps mw-list-item"><a href="https://ps.wikipedia.org/wiki/%D8%AB%D8%A7%D9%86%D9%8A%D9%87" title="ثانيه — paštu" lang="ps" hreflang="ps" data-title="ثانيه" data-language-autonym="پښتو" data-language-local-name="paštu" class="interlanguage-link-target"><span>پښتو</span></a></li><li class="interlanguage-link interwiki-jam mw-list-item"><a href="https://jam.wikipedia.org/wiki/Sekan" title="Sekan — jamaikankreolienglanti" lang="jam" hreflang="jam" data-title="Sekan" data-language-autonym="Patois" data-language-local-name="jamaikankreolienglanti" class="interlanguage-link-target"><span>Patois</span></a></li><li class="interlanguage-link interwiki-pms mw-list-item"><a href="https://pms.wikipedia.org/wiki/Second" title="Second — piemonte" lang="pms" hreflang="pms" data-title="Second" data-language-autonym="Piemontèis" data-language-local-name="piemonte" class="interlanguage-link-target"><span>Piemontèis</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/Sekunn" title="Sekunn — alasaksa" lang="nds" hreflang="nds" data-title="Sekunn" data-language-autonym="Plattdüütsch" data-language-local-name="alasaksa" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Sekunda" title="Sekunda — puola" lang="pl" hreflang="pl" data-title="Sekunda" data-language-autonym="Polski" data-language-local-name="puola" 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/Segundo" title="Segundo — portugali" lang="pt" hreflang="pt" data-title="Segundo" data-language-autonym="Português" data-language-local-name="portugali" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-crh mw-list-item"><a href="https://crh.wikipedia.org/wiki/Saniye" title="Saniye — krimintataari" lang="crh" hreflang="crh" data-title="Saniye" data-language-autonym="Qırımtatarca" data-language-local-name="krimintataari" class="interlanguage-link-target"><span>Qırımtatarca</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Secund%C4%83" title="Secundă — romania" lang="ro" hreflang="ro" data-title="Secundă" data-language-autonym="Română" data-language-local-name="romania" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Sikunthu" title="Sikunthu — ketšua" lang="qu" hreflang="qu" data-title="Sikunthu" data-language-autonym="Runa Simi" data-language-local-name="ketšua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-rue mw-list-item"><a href="https://rue.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — ruteeni" lang="rue" hreflang="rue" data-title="Секунда" data-language-autonym="Русиньскый" data-language-local-name="ruteeni" class="interlanguage-link-target"><span>Русиньскый</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — venäjä" lang="ru" hreflang="ru" data-title="Секунда" data-language-autonym="Русский" data-language-local-name="venäjä" 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%A1%D3%A9%D0%BA%D2%AF%D2%AF%D0%BD%D0%B4%D1%8D" title="Сөкүүндэ — jakuutti" lang="sah" hreflang="sah" data-title="Сөкүүндэ" data-language-autonym="Саха тыла" data-language-local-name="jakuutti" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-sat mw-list-item"><a href="https://sat.wikipedia.org/wiki/%E1%B1%B4%E1%B1%A4%E1%B1%AF%E1%B1%A4%E1%B1%A1" title="ᱴᱤᱯᱤᱡ — santali" lang="sat" hreflang="sat" data-title="ᱴᱤᱯᱤᱡ" data-language-autonym="ᱥᱟᱱᱛᱟᱲᱤ" data-language-local-name="santali" class="interlanguage-link-target"><span>ᱥᱟᱱᱛᱟᱲᱤ</span></a></li><li class="interlanguage-link interwiki-sc mw-list-item"><a href="https://sc.wikipedia.org/wiki/Segundu" title="Segundu — sardi" lang="sc" hreflang="sc" data-title="Segundu" data-language-autonym="Sardu" data-language-local-name="sardi" class="interlanguage-link-target"><span>Sardu</span></a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Seicont" title="Seicont — skotti" lang="sco" hreflang="sco" data-title="Seicont" data-language-autonym="Scots" data-language-local-name="skotti" class="interlanguage-link-target"><span>Scots</span></a></li><li class="interlanguage-link interwiki-nso mw-list-item"><a href="https://nso.wikipedia.org/wiki/Motsotswana" title="Motsotswana — pohjoissotho" lang="nso" hreflang="nso" data-title="Motsotswana" data-language-autonym="Sesotho sa Leboa" data-language-local-name="pohjoissotho" class="interlanguage-link-target"><span>Sesotho sa Leboa</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Sekonda" title="Sekonda — albania" lang="sq" hreflang="sq" data-title="Sekonda" data-language-autonym="Shqip" data-language-local-name="albania" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wikipedia.org/wiki/%E0%B6%AD%E0%B6%AD%E0%B7%8A%E0%B6%B4%E0%B6%BB%E0%B6%BA" title="තත්පරය — sinhala" lang="si" hreflang="si" data-title="තත්පරය" data-language-autonym="සිංහල" data-language-local-name="sinhala" class="interlanguage-link-target"><span>සිංහල</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Second" title="Second — Simple English" lang="en-simple" hreflang="en-simple" data-title="Second" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sd mw-list-item"><a href="https://sd.wikipedia.org/wiki/%D8%B3%D9%8A%DA%AA%D9%86%DA%8A" title="سيڪنڊ — sindhi" lang="sd" hreflang="sd" data-title="سيڪنڊ" data-language-autonym="سنڌي" data-language-local-name="sindhi" class="interlanguage-link-target"><span>سنڌي</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Sekunda" title="Sekunda — slovakki" lang="sk" hreflang="sk" data-title="Sekunda" data-language-autonym="Slovenčina" data-language-local-name="slovakki" 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/Sekunda" title="Sekunda — sloveeni" lang="sl" hreflang="sl" data-title="Sekunda" data-language-autonym="Slovenščina" data-language-local-name="sloveeni" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-cu mw-list-item"><a href="https://cu.wikipedia.org/wiki/%D0%94%D1%94%D1%B5%D1%82%D1%94%D1%80%D0%BE%D0%BB%D1%94%D0%BF%D1%82%D0%BE" title="Дєѵтєролєпто — kirkkoslaavi" lang="cu" hreflang="cu" data-title="Дєѵтєролєпто" data-language-autonym="Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ" data-language-local-name="kirkkoslaavi" class="interlanguage-link-target"><span>Словѣньскъ / ⰔⰎⰑⰂⰡⰐⰠⰔⰍⰟ</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/Sek%C5%8Dnda" title="Sekōnda — sleesia" lang="szl" hreflang="szl" data-title="Sekōnda" data-language-autonym="Ślůnski" data-language-local-name="sleesia" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-so mw-list-item"><a href="https://so.wikipedia.org/wiki/Ilbiriqsi" title="Ilbiriqsi — somali" lang="so" hreflang="so" data-title="Ilbiriqsi" data-language-autonym="Soomaaliga" data-language-local-name="somali" class="interlanguage-link-target"><span>Soomaaliga</span></a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wikipedia.org/wiki/%DA%86%D8%B1%DA%A9%DB%95" title="چرکە — soranî" lang="ckb" hreflang="ckb" data-title="چرکە" data-language-autonym="کوردی" data-language-local-name="soranî" 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%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4" title="Секунд — serbia" lang="sr" hreflang="sr" data-title="Секунд" data-language-autonym="Српски / srpski" data-language-local-name="serbia" 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/Sekunda" title="Sekunda — serbokroaatti" lang="sh" hreflang="sh" data-title="Sekunda" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroaatti" 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/Detik" title="Detik — sunda" lang="su" hreflang="su" data-title="Detik" data-language-autonym="Sunda" data-language-local-name="sunda" class="interlanguage-link-target"><span>Sunda</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Sekund" title="Sekund — ruotsi" lang="sv" hreflang="sv" data-title="Sekund" data-language-autonym="Svenska" data-language-local-name="ruotsi" 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/Segundo" title="Segundo — tagalog" lang="tl" hreflang="tl" data-title="Segundo" data-language-autonym="Tagalog" data-language-local-name="tagalog" class="interlanguage-link-target"><span>Tagalog</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%A8%E0%AF%8A%E0%AE%9F%E0%AE%BF_(%E0%AE%95%E0%AE%BE%E0%AE%B2_%E0%AE%85%E0%AE%B3%E0%AE%B5%E0%AF%81)" title="நொடி (கால அளவு) — tamili" lang="ta" hreflang="ta" data-title="நொடி (கால அளவு)" data-language-autonym="தமிழ்" data-language-local-name="tamili" 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/Tasint" title="Tasint — kabyyli" lang="kab" hreflang="kab" data-title="Tasint" data-language-autonym="Taqbaylit" data-language-local-name="kabyyli" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-roa-tara mw-list-item"><a href="https://roa-tara.wikipedia.org/wiki/Seconne" title="Seconne — Tarantino" lang="nap-x-tara" hreflang="nap-x-tara" data-title="Seconne" data-language-autonym="Tarandíne" data-language-local-name="Tarantino" class="interlanguage-link-target"><span>Tarandíne</span></a></li><li class="interlanguage-link interwiki-tt mw-list-item"><a href="https://tt.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4" title="Секунд — tataari" lang="tt" hreflang="tt" data-title="Секунд" data-language-autonym="Татарча / tatarça" data-language-local-name="tataari" 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%B8%E0%B1%86%E0%B0%95%E0%B0%82%E0%B0%A1%E0%B1%81" title="సెకండు — telugu" lang="te" hreflang="te" data-title="సెకండు" 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%99%E0%B8%B2%E0%B8%97%E0%B8%B5" title="วินาที — thai" lang="th" hreflang="th" data-title="วินาที" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Gi%C3%A2y" title="Giây — vietnam" lang="vi" hreflang="vi" data-title="Giây" data-language-autonym="Tiếng Việt" data-language-local-name="vietnam" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-tg mw-list-item"><a href="https://tg.wikipedia.org/wiki/%D0%A1%D0%BE%D0%BD%D0%B8%D1%8F" title="Сония — tadžikki" lang="tg" hreflang="tg" data-title="Сония" data-language-autonym="Тоҷикӣ" data-language-local-name="tadžikki" class="interlanguage-link-target"><span>Тоҷикӣ</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Saniye" title="Saniye — turkki" lang="tr" hreflang="tr" data-title="Saniye" data-language-autonym="Türkçe" data-language-local-name="turkki" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BA%D1%83%D0%BD%D0%B4%D0%B0" title="Секунда — ukraina" lang="uk" hreflang="uk" data-title="Секунда" data-language-autonym="Українська" data-language-local-name="ukraina" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D8%AB%D8%A7%D9%86%DB%8C%DB%81" title="ثانیہ — urdu" lang="ur" hreflang="ur" data-title="ثانیہ" data-language-autonym="اردو" data-language-local-name="urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-za mw-list-item"><a href="https://za.wikipedia.org/wiki/Miux" title="Miux — zhuang" lang="za" hreflang="za" data-title="Miux" data-language-autonym="Vahcuengh" data-language-local-name="zhuang" class="interlanguage-link-target"><span>Vahcuengh</span></a></li><li class="interlanguage-link interwiki-vep mw-list-item"><a href="https://vep.wikipedia.org/wiki/Sekund" title="Sekund — vepsä" lang="vep" hreflang="vep" data-title="Sekund" data-language-autonym="Vepsän kel’" data-language-local-name="vepsä" class="interlanguage-link-target"><span>Vepsän kel’</span></a></li><li class="interlanguage-link interwiki-wa mw-list-item"><a href="https://wa.wikipedia.org/wiki/Sigonde" title="Sigonde — valloni" lang="wa" hreflang="wa" data-title="Sigonde" data-language-autonym="Walon" data-language-local-name="valloni" class="interlanguage-link-target"><span>Walon</span></a></li><li class="interlanguage-link interwiki-zh-classical mw-list-item"><a href="https://zh-classical.wikipedia.org/wiki/%E7%A7%92" title="秒 — klassinen kiina" lang="lzh" hreflang="lzh" data-title="秒" data-language-autonym="文言" data-language-local-name="klassinen kiina" class="interlanguage-link-target"><span>文言</span></a></li><li class="interlanguage-link interwiki-vls mw-list-item"><a href="https://vls.wikipedia.org/wiki/Seconde" title="Seconde — länsiflaami" lang="vls" hreflang="vls" data-title="Seconde" data-language-autonym="West-Vlams" data-language-local-name="länsiflaami" class="interlanguage-link-target"><span>West-Vlams</span></a></li><li class="interlanguage-link interwiki-war mw-list-item"><a href="https://war.wikipedia.org/wiki/Segundo" title="Segundo — waray" lang="war" hreflang="war" data-title="Segundo" data-language-autonym="Winaray" data-language-local-name="waray" class="interlanguage-link-target"><span>Winaray</span></a></li><li class="interlanguage-link interwiki-wo mw-list-item"><a href="https://wo.wikipedia.org/wiki/Saa" title="Saa — wolof" lang="wo" hreflang="wo" data-title="Saa" data-language-autonym="Wolof" data-language-local-name="wolof" class="interlanguage-link-target"><span>Wolof</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E7%A7%92" title="秒 — wu-kiina" lang="wuu" hreflang="wuu" data-title="秒" data-language-autonym="吴语" data-language-local-name="wu-kiina" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yi mw-list-item"><a href="https://yi.wikipedia.org/wiki/%D7%A1%D7%A2%D7%A7%D7%95%D7%A0%D7%93%D7%A2" title="סעקונדע — jiddiš" lang="yi" hreflang="yi" data-title="סעקונדע" 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Muita merkityksiä varten katso <a href="/wiki/Sekunti_(t%C3%A4smennyssivu)" class="mw-disambig" title="Sekunti (täsmennyssivu)">Sekunti (täsmennyssivu)</a>.</i></div> <p><b>Sekunti</b> (tunnus <b>s</b><sup id="cite_ref-si_opas2019_1-0" class="reference"><a href="#cite_note-si_opas2019-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>) on <a href="/wiki/Kansainv%C3%A4linen_yksikk%C3%B6j%C3%A4rjestelm%C3%A4" title="Kansainvälinen yksikköjärjestelmä">SI-järjestelmän</a> mukainen <a href="/wiki/Aika" title="Aika">ajan</a> perusyksikkö. Se on alun perin saatu jakamalla <a href="/wiki/Vuorokausi" title="Vuorokausi">vuorokausi</a> 24 <a href="/wiki/Tunti" title="Tunti">tuntiin</a>, tunti 60 <a href="/wiki/Minuutti" title="Minuutti">minuuttiin</a> ja minuutti edelleen 60 sekuntiin. Nykyisin sekunti on määritelty <a href="/wiki/Cesium" title="Cesium">cesiumin</a> säteilyn avulla. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Määritelmä"><span id="M.C3.A4.C3.A4ritelm.C3.A4"></span>Määritelmä</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=1" title="Muokkaa osiota Määritelmä" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=1" title="Muokkaa osion lähdekoodia: Määritelmä"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sekunnin nykyisen määritelmän vahvisti 26. <a href="/wiki/Yleinen_paino-_ja_mittakonferenssi" title="Yleinen paino- ja mittakonferenssi">yleinen paino- ja mittakonferenssi</a> vuonna 2019. Sekunti määritellään kiinnittämällä <a href="/wiki/Cesium" title="Cesium">cesium</a>-133-atomin häiritsemättömän perustilan ylihienorakennesiirtymää vastaavan säteilyn taajuudeksi 9 192 631 770 <a href="/wiki/Hertsi" title="Hertsi">Hz</a>, missä Hz on yhtä kuin s<sup>-1</sup>.<sup id="cite_ref-CGPM_26_2-0" class="reference"><a href="#cite_note-CGPM_26-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-si_opas2019_1-1" class="reference"><a href="#cite_note-si_opas2019-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Historia">Historia</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=2" title="Muokkaa osiota Historia" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=2" title="Muokkaa osion lähdekoodia: Historia"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Alun perin sekunti on minuutin kuudeskymmenesosa ja täten 1/86 400 vuorokautta. Minuutin jakaminen 60 sekuntiin perustuu <a href="/wiki/Sumer" title="Sumer">sumerilaisten</a> keksimään ja <a href="/wiki/Babylonia" title="Babylonia">babylonialaisten</a> käyttämään <a href="/wiki/Seksagesimaalij%C3%A4rjestelm%C3%A4" title="Seksagesimaalijärjestelmä">seksagesimaalijärjestelmään</a> (60-järjestelmään). </p><p>Edellä mainitulla vuorokaudella tarkoitettiin aurinkovuorokautta, joka saadaan mittaamalla aika Maan pyörähtäessä Aurinkoon nähden yhden kierroksen. Koska vuorokauden mittaaminen Aurinkoa vasten tuottaa Maan kiertoradan eri kohdissa erilaisen tuloksen, sovittiin vertailukohdaksi vuoden Aurinkovuorokausien keskiarvo. Tämä keskiaurinkovuorokausi on noin 86 400 sekuntia ja vuosi 365,2422 keskiaurinkovuorokautta.<sup id="cite_ref-sim_3-0" class="reference"><a href="#cite_note-sim-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Maapallon pyörimisliikkeen nopeus ei kuitenkaan ole aivan tarkkaan vakio. Tämän vuoksi, ja koska Maan kiertoliike Auringon ympäri on huomattavasti tasaisempaa, sekunti määriteltiin vuonna 1960 uudestaan siten, että se oli 1/31 556 925,9747 trooppisen vuotta sellaisena kuin se oli vuoden 1900 alkuhetkellä efemeridiaikaa. Sekunnin pituus ei tällöin muuttunut, mutta se tuli määritellyksi entistä tarkemmin. Vuoden pituus oli siten 365 vuorokautta, 5 tuntia ja 48 minuuttia 45,9747 sekuntia.<sup id="cite_ref-Oja_4-0" class="reference"><a href="#cite_note-Oja-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-sim_3-1" class="reference"><a href="#cite_note-sim-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>Vuonna 1967 sekunti määriteltiin jälleen uudestaan <a href="/wiki/Atomikello" title="Atomikello">atomikellon</a> avulla. Vahvistetun määritelmän mukaan sekunti oli 9 192 631 770 kertaa sellaisen <a href="/wiki/S%C3%A4teily" title="Säteily">säteilyn</a> <a href="/wiki/Jaksonaika" title="Jaksonaika">jaksonaika</a>, joka vastaa <a href="/wiki/Cesium" title="Cesium">cesium</a>-133-atomin siirtymää perustilan ylihienorakenteen kahden <a href="/wiki/Energiataso" class="mw-redirect" title="Energiataso">energiatason</a> välillä.<sup id="cite_ref-Oja_4-1" class="reference"><a href="#cite_note-Oja-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><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><sup id="cite_ref-bipm_s_6-0" class="reference"><a href="#cite_note-bipm_s-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Vuonna 2018 määritelmä muotoiltiin sanallisesti uudelleen, mutta aikaisemman kanssa yhtäpitävällä tavalla. </p> <div class="mw-heading mw-heading2"><h2 id="Karkaussekunnit">Karkaussekunnit</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=3" title="Muokkaa osiota Karkaussekunnit" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=3" title="Muokkaa osion lähdekoodia: Karkaussekunnit"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Jotta nykyiseen määritelmään perustuva <a href="/wiki/Koordinoitu_yleisaika" title="Koordinoitu yleisaika">koordinoitu yleisaika</a> (UTC) pysyisi käytännöllisesti katsoen yhdenmukaisena <a href="/wiki/Aikaj%C3%A4rjestelm%C3%A4#UT1" title="Aikajärjestelmä">UT1</a>-ajan kanssa, lisätään kellonaikaan <a href="/wiki/Karkaussekunti" title="Karkaussekunti">karkaussekunti</a> vuodenvaihteessa tai kesäkuun lopussa silloin, kun niiden ero lähestyy täyttä sekuntia.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="SI-kertoimet">SI-kertoimet</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=4" title="Muokkaa osiota SI-kertoimet" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=4" title="Muokkaa osion lähdekoodia: SI-kertoimet"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable"> <tbody><tr> <th>Kerroin </th> <th>Nimi </th> <th>Tunnus </th> <td rowspan="12"> </td> <th>Kerroin </th> <th>Nimi </th> <th>Tunnus </th></tr> <tr> <td>10<sup>0</sup> </td> <td><b>sekunti</b> </td> <td>s </td> <td>  </td> <td>  </td> <td>  </td></tr> <tr> <td>10<sup>1</sup> </td> <td>dekasekunti </td> <td>das </td> <td>10<sup>−1</sup> </td> <td>desisekunti </td> <td>ds </td></tr> <tr> <td>10<sup>2</sup> </td> <td>hehtosekunti </td> <td>hs </td> <td>10<sup>−2</sup> </td> <td>senttisekunti </td> <td>cs </td></tr> <tr> <td>10<sup>3</sup> </td> <td>kilosekunti </td> <td>ks </td> <td>10<sup>−3</sup> </td> <td>millisekunti </td> <td>ms </td></tr> <tr> <td>10<sup>6</sup> </td> <td>megasekunti </td> <td>Ms </td> <td>10<sup>−6</sup> </td> <td>mikrosekunti </td> <td>μs </td></tr> <tr> <td>10<sup>9</sup> </td> <td>gigasekunti </td> <td>Gs </td> <td>10<sup>−9</sup> </td> <td>nanosekunti </td> <td>ns </td></tr> <tr> <td>10<sup>12</sup> </td> <td>terasekunti </td> <td>Ts </td> <td>10<sup>−12</sup> </td> <td>pikosekunti </td> <td>ps </td></tr> <tr> <td>10<sup>15</sup> </td> <td>petasekunti </td> <td>Ps </td> <td>10<sup>−15</sup> </td> <td>femtosekunti </td> <td>fs </td></tr> <tr> <td>10<sup>18</sup> </td> <td>eksasekunti </td> <td>Es </td> <td>10<sup>−18</sup> </td> <td>attosekunti </td> <td>as </td></tr> <tr> <td>10<sup>21</sup> </td> <td>tsettasekunti </td> <td>Zs </td> <td>10<sup>−21</sup> </td> <td>tseptosekunti </td> <td>zs </td></tr> <tr> <td>10<sup>24</sup> </td> <td>jottasekunti </td> <td>Ys </td> <td>10<sup>−24</sup> </td> <td>joktosekunti </td> <td>ys </td></tr> </tbody></table> <div class="mw-heading mw-heading2"><h2 id="Lähteet"><span id="L.C3.A4hteet"></span>Lähteet</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=5" title="Muokkaa osiota Lähteet" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=5" title="Muokkaa osion lähdekoodia: Lähteet"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span class="kirjaviite" title="Kirjaviite">Oja, Heikki: <i>Aikakirja 2007</i>.  Helsinki:  Helsingin yliopiston almanakkatoimisto, 2007.  <a href="/wiki/Toiminnot:Kirjal%C3%A4hteet/952-10-3221-9" title="Toiminnot:Kirjalähteet/952-10-3221-9">ISBN 952-10-3221-9</a>  <a rel="nofollow" class="external text" href="http://almanakka.helsinki.fi/aikakirja/Aikakirja2007kokonaan.pdf">Teoksen verkkoversio</a> Viitattu 7.7.2010.</span></li> <li><span class="verkkoviite" title="Verkkoviite">Suomen Standardoimisliitto: <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120831234747/http://www.sfs.fi/files/70/si-opas.pdf">SI-opas</a> <small>(PDF)</small> (sivu 3) <i>SFS-oppaat</i>. 4.11.2002. Suomen Standardoimisliitto. <a href="/wiki/Toiminnot:Kirjal%C3%A4hteet/952-5420-93-0" title="Toiminnot:Kirjalähteet/952-5420-93-0">ISBN 952-5420-93-0</a>  Viitattu 18.2.2013.</span></li></ul> <div class="mw-heading mw-heading3"><h3 id="Viitteet">Viitteet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=6" title="Muokkaa osiota Viitteet" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=6" title="Muokkaa osion lähdekoodia: Viitteet"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r23091323">.mw-parser-output div.viitteet-malline ol.references{list-style-type:inherit}.mw-parser-output .viitteet-sarakkeet li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output ol.references>li:target{background-color:var(--background-color-interactive,#DEF)}.mw-parser-output sup.reference:target{background-color:var(--background-color-interactive,#DEF)}.mw-parser-output span[rel="mw:referencedBy"]{counter-reset:mw-ref-linkback 0}.mw-parser-output span[rel="mw:referencedBy"]>a::before{font-style:italic;content:counter(mw-ref-linkback,lower-alpha)}body.action-info .mw-parser-output :target{background-color:var(--background-color-interactive,#DEF)}</style><div class="viitteet-malline" style="list-style-type:decimal;"><ol class="references"> <li id="cite_note-si_opas2019-1"><span class="mw-cite-backlink">↑ <a href="#cite_ref-si_opas2019_1-0"><sup><i>a</i></sup></a> <a href="#cite_ref-si_opas2019_1-1"><sup><i>b</i></sup></a></span> <span class="reference-text"><span class="kirjaviite" title="Kirjaviite">Suomen Standardisoimisliitto: <i>SI-opas : 2019 : kansainvälinen suure- ja yksikköjärjestelmä = international system of quantities and units</i>, s. 21.  Suomen Standardisoimisliitto SFS ry, 2019.  <a href="/wiki/Toiminnot:Kirjal%C3%A4hteet/978-952-242-411-2" title="Toiminnot:Kirjalähteet/978-952-242-411-2">ISBN 978-952-242-411-2</a>  <a rel="nofollow" class="external text" href="https://sfs.fi/palvelut/oppimateriaalit-ja-oppilaitosyhteistyo/lataa-si-opas/">Teoksen lataussivu</a>.</span></span> </li> <li id="cite_note-CGPM_26-2"><span class="mw-cite-backlink"><a href="#cite_ref-CGPM_26_2-0">↑</a></span> <span class="reference-text"><span class="verkkoviite" title="Verkkoviite"><a rel="nofollow" class="external text" href="https://www.bipm.org/en/CGPM/db/26/1/">Resolution 1 of the 26th CGPM (2018)</a> ((Yksiköiden määritelmät kohdassa Appendix 3: The base units of the SI)) Bureau international des poids et mesures. Viitattu 20.5.2019.</span></span> </li> <li id="cite_note-sim-3"><span class="mw-cite-backlink">↑ <a href="#cite_ref-sim_3-0"><sup><i>a</i></sup></a> <a href="#cite_ref-sim_3-1"><sup><i>b</i></sup></a></span> <span class="reference-text"><span class="kirjaviite" title="Kirjaviite">Simons, Lennart: <i>Fysiikka korkeakouluja varten</i>.  Porvoo:  WSOY, 1963. </span></span> </li> <li id="cite_note-Oja-4"><span class="mw-cite-backlink">↑ <a href="#cite_ref-Oja_4-0"><sup><i>a</i></sup></a> <a href="#cite_ref-Oja_4-1"><sup><i>b</i></sup></a></span> <span class="reference-text">Oja 2007, s. 98–99</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><a href="#cite_ref-5">↑</a></span> <span class="reference-text"><span class="verkkoviite" title="Verkkoviite"><a rel="nofollow" class="external text" href="http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf">The International System of Units (SI)</a> Bureau International des Poids et Mesures.</span></span> </li> <li id="cite_note-bipm_s-6"><span class="mw-cite-backlink"><a href="#cite_ref-bipm_s_6-0">↑</a></span> <span class="reference-text">International Bureau of Weights and Measures: <a rel="nofollow" class="external text" href="http://www.bipm.org/en/si/si_brochure/chapter2/2-1/second.html">SI-sekunti</a></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><a href="#cite_ref-7">↑</a></span> <span class="reference-text">Oja 2007, s. 100–101</span> </li> </ol> </div> <div class="mw-heading mw-heading2"><h2 id="Aiheesta_muualla">Aiheesta muualla</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sekunti&veaction=edit&section=7" title="Muokkaa osiota Aiheesta muualla" class="mw-editsection-visualeditor"><span>muokkaa</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Sekunti&action=edit&section=7" title="Muokkaa osion lähdekoodia: Aiheesta muualla"><span>muokkaa wikitekstiä</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/20px-Commons-logo.svg.png" decoding="async" width="10" height="13" class="mw-file-element" data-file-width="1024" data-file-height="1376" /></span></span> Kuvia tai muita tiedostoja aiheesta <b><a href="https://commons.wikimedia.org/wiki/Category:Second" class="extiw" title="commons:Category:Second">Sekunti</a></b> <a href="https://commons.wikimedia.org/wiki/Etusivu" class="extiw" title="commons:Etusivu">Wikimedia Commonsissa</a></li></ul> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20130825043824/https://yle.fi/uutiset/optinen_atomikello_voi_muuttaa_sekunnin_maaritelmaa/6726472">Optinen atomikello voi muuttaa sekunnin määritelmää</a> Yle.fi 20.7.2013 <i>Archive.org</i></li></ul></div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Noudettu kohteesta ”<a dir="ltr" href="https://fi.wikipedia.org/w/index.php?title=Sekunti&oldid=23120310">https://fi.wikipedia.org/w/index.php?title=Sekunti&oldid=23120310</a>”</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Toiminnot:Luokat" title="Toiminnot:Luokat">Luokat</a>: <ul><li><a href="/wiki/Luokka:Ajan_yksik%C3%B6t" title="Luokka:Ajan yksiköt">Ajan yksiköt</a></li><li><a href="/wiki/Luokka:SI-j%C3%A4rjestelm%C3%A4n_perusyksik%C3%B6t" title="Luokka:SI-järjestelmän perusyksiköt">SI-järjestelmän perusyksiköt</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Piilotettu luokka: <ul><li><a href="/wiki/Luokka:Seulonnan_keskeiset_artikkelit" title="Luokka:Seulonnan keskeiset artikkelit">Seulonnan keskeiset artikkelit</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Sivua on viimeksi muutettu 20. maaliskuuta 2025 kello 05.13.</li> <li id="footer-info-copyright">Teksti on saatavilla <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.fi">Creative Commons Attribution/Share-Alike</a> -lisenssillä; lisäehtoja voi sisältyä. 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tabindex="-1" data-event-name="history-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-history mw-ui-icon-wikimedia-wikimedia-history"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only mw-watchlink" id="ca-watchstar-sticky-header" tabindex="-1" data-event-name="watch-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-star mw-ui-icon-wikimedia-wikimedia-star"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-ve-edit-sticky-header" tabindex="-1" data-event-name="ve-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-edit mw-ui-icon-wikimedia-wikimedia-edit"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-edit-sticky-header" tabindex="-1" data-event-name="wikitext-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-wikiText mw-ui-icon-wikimedia-wikimedia-wikiText"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-viewsource-sticky-header" tabindex="-1" data-event-name="ve-edit-protected-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-editLock mw-ui-icon-wikimedia-wikimedia-editLock"></span> <span></span> </a> </div> <div class="vector-sticky-header-buttons"> <button class="cdx-button cdx-button--weight-quiet mw-interlanguage-selector" id="p-lang-btn-sticky-header" tabindex="-1" data-event-name="ui.dropdown-p-lang-btn-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>160 kieltä</span> </button> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive" id="ca-addsection-sticky-header" tabindex="-1" data-event-name="addsection-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbleAdd-progressive mw-ui-icon-wikimedia-speechBubbleAdd-progressive"></span> <span>Lisää aihe</span> </a> </div> <div class="vector-sticky-header-icon-end"> <div class="vector-user-links"> </div> </div> </div> </div> </div> <div class="mw-portlet mw-portlet-dock-bottom emptyPortlet" id="p-dock-bottom"> <ul> </ul> </div> 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