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href="/wiki/%E7%89%B9%E5%88%A5:%E3%83%88%E3%83%BC%E3%82%AF%E3%83%9A%E3%83%BC%E3%82%B8" title="このIPアドレスからなされた編集についての議論[n]" accesskey="n"><span>トーク</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="サイト"> <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="目次" 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">目次</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">非表示</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">ページ先頭</div> </a> </li> <li id="toc-春分点と星座" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#春分点と星座"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>春分点と星座</span> </div> </a> <button aria-controls="toc-春分点と星座-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>春分点と星座サブセクションを切り替えます</span> </button> <ul id="toc-春分点と星座-sublist" class="vector-toc-list"> <li id="toc-ニューエイジにおける主張" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#ニューエイジにおける主張"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>ニューエイジにおける主張</span> </div> </a> <ul id="toc-ニューエイジにおける主張-sublist" class="vector-toc-list"> <li id="toc-水瓶座の時代" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#水瓶座の時代"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1.1</span> <span>水瓶座の時代</span> </div> </a> <ul id="toc-水瓶座の時代-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> <li id="toc-IAU2006歳差章動理論" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#IAU2006歳差章動理論"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>IAU2006歳差章動理論</span> </div> </a> <ul id="toc-IAU2006歳差章動理論-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-参考文献" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#参考文献"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>参考文献</span> </div> </a> <ul id="toc-参考文献-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-注釈" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#注釈"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>注釈</span> </div> </a> <ul id="toc-注釈-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-関連項目" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#関連項目"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>関連項目</span> </div> </a> <ul id="toc-関連項目-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="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="目次" > <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="目次の表示・非表示を切り替え" > <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">目次の表示・非表示を切り替え</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">春分点</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="特定の記事の別の言語版に移動します。利用可能な言語36件" > <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-36" 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">36の言語版</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/Lentepunt" title="アフリカーンス語: Lentepunt" lang="af" hreflang="af" data-title="Lentepunt" data-language-autonym="Afrikaans" data-language-local-name="アフリカーンス語" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A3%D9%88%D9%84_%D8%A7%D9%84%D8%AD%D9%85%D9%84" title="アラビア語: أول الحمل" lang="ar" hreflang="ar" data-title="أول الحمل" data-language-autonym="العربية" data-language-local-name="アラビア語" 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/Puntu_Aries" title="アストゥリアス語: Puntu Aries" lang="ast" hreflang="ast" data-title="Puntu Aries" data-language-autonym="Asturianu" data-language-local-name="アストゥリアス語" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Punt_d%27%C3%80ries" title="カタロニア語: Punt d'Àries" lang="ca" hreflang="ca" data-title="Punt d'Àries" data-language-autonym="Català" data-language-local-name="カタロニア語" 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/Jarn%C3%AD_bod" title="チェコ語: Jarní bod" lang="cs" hreflang="cs" data-title="Jarní bod" data-language-autonym="Čeština" data-language-local-name="チェコ語" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/For%C3%A5rspunktet" title="デンマーク語: Forårspunktet" lang="da" hreflang="da" data-title="Forårspunktet" data-language-autonym="Dansk" data-language-local-name="デンマーク語" 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/Fr%C3%BChlingspunkt" title="ドイツ語: Frühlingspunkt" lang="de" hreflang="de" data-title="Frühlingspunkt" data-language-autonym="Deutsch" data-language-local-name="ドイツ語" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%95%CE%B1%CF%81%CE%B9%CE%BD%CF%8C_%CF%83%CE%B7%CE%BC%CE%B5%CE%AF%CE%BF" title="ギリシャ語: Εαρινό σημείο" lang="el" hreflang="el" data-title="Εαρινό σημείο" data-language-autonym="Ελληνικά" data-language-local-name="ギリシャ語" 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/First_point_of_Aries" title="英語: First point of Aries" lang="en" hreflang="en" data-title="First point of Aries" data-language-autonym="English" data-language-local-name="英語" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Verna_punkto" title="エスペラント語: Verna punkto" lang="eo" hreflang="eo" data-title="Verna punkto" data-language-autonym="Esperanto" data-language-local-name="エスペラント語" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Punto_Aries" title="スペイン語: Punto Aries" lang="es" hreflang="es" data-title="Punto Aries" data-language-autonym="Español" data-language-local-name="スペイン語" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Aries_Puntua" title="バスク語: Aries Puntua" lang="eu" hreflang="eu" data-title="Aries Puntua" data-language-autonym="Euskara" data-language-local-name="バスク語" 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/%D9%86%D9%82%D8%B7%D9%87_%D8%A8%D9%87%D8%A7%D8%B1" title="ペルシア語: نقطه بهار" lang="fa" hreflang="fa" data-title="نقطه بهار" data-language-autonym="فارسی" data-language-local-name="ペルシア語" 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/Point_vernal" title="フランス語: Point vernal" lang="fr" hreflang="fr" data-title="Point vernal" data-language-autonym="Français" data-language-local-name="フランス語" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-frr mw-list-item"><a href="https://frr.wikipedia.org/wiki/Wosponkt" title="北フリジア語: Wosponkt" lang="frr" hreflang="frr" data-title="Wosponkt" data-language-autonym="Nordfriisk" data-language-local-name="北フリジア語" class="interlanguage-link-target"><span>Nordfriisk</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/T%C3%BAsphointe_an_Reithe" title="アイルランド語: Túsphointe an Reithe" lang="ga" hreflang="ga" data-title="Túsphointe an Reithe" data-language-autonym="Gaeilge" data-language-local-name="アイルランド語" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Proljetna_to%C4%8Dka" title="クロアチア語: Proljetna točka" lang="hr" hreflang="hr" data-title="Proljetna točka" data-language-autonym="Hrvatski" data-language-local-name="クロアチア語" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-ig mw-list-item"><a href="https://ig.wikipedia.org/wiki/Isiokwu_Mb%E1%BB%A5_nke_Aries" title="イボ語: Isiokwu Mbụ nke Aries" lang="ig" hreflang="ig" data-title="Isiokwu Mbụ nke Aries" data-language-autonym="Igbo" data-language-local-name="イボ語" class="interlanguage-link-target"><span>Igbo</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Punto_vernale" title="イタリア語: Punto vernale" lang="it" hreflang="it" data-title="Punto vernale" data-language-autonym="Italiano" data-language-local-name="イタリア語" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%B6%98%EB%B6%84%EC%A0%90" title="韓国語: 춘분점" lang="ko" hreflang="ko" data-title="춘분점" data-language-autonym="한국어" data-language-local-name="韓国語" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Fr%C3%A9ijoerspunkt" title="ルクセンブルク語: Fréijoerspunkt" lang="lb" hreflang="lb" data-title="Fréijoerspunkt" data-language-autonym="Lëtzebuergesch" data-language-local-name="ルクセンブルク語" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D1%80%D0%BE%D0%BB%D0%B5%D1%82%D0%BD%D0%B0_%D1%82%D0%BE%D1%87%D0%BA%D0%B0" title="マケドニア語: Пролетна точка" lang="mk" hreflang="mk" data-title="Пролетна точка" data-language-autonym="Македонски" data-language-local-name="マケドニア語" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Titik_Pertama_Hamal" title="マレー語: Titik Pertama Hamal" lang="ms" hreflang="ms" data-title="Titik Pertama Hamal" data-language-autonym="Bahasa Melayu" data-language-local-name="マレー語" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Lentepunt" title="オランダ語: Lentepunt" lang="nl" hreflang="nl" data-title="Lentepunt" data-language-autonym="Nederlands" data-language-local-name="オランダ語" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Punkt_Barana" title="ポーランド語: Punkt Barana" lang="pl" hreflang="pl" data-title="Punkt Barana" data-language-autonym="Polski" data-language-local-name="ポーランド語" 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/Ponto_vernal" title="ポルトガル語: Ponto vernal" lang="pt" hreflang="pt" data-title="Ponto vernal" data-language-autonym="Português" data-language-local-name="ポルトガル語" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru badge-Q70894304 mw-list-item" title=""><a href="https://ru.wikipedia.org/wiki/%D0%A2%D0%BE%D1%87%D0%BA%D0%B0_%D0%B2%D0%B5%D1%81%D0%B5%D0%BD%D0%BD%D0%B5%D0%B3%D0%BE_%D1%80%D0%B0%D0%B2%D0%BD%D0%BE%D0%B4%D0%B5%D0%BD%D1%81%D1%82%D0%B2%D0%B8%D1%8F" title="ロシア語: Точка весеннего равноденствия" lang="ru" hreflang="ru" data-title="Точка весеннего равноденствия" data-language-autonym="Русский" data-language-local-name="ロシア語" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Proljetna_to%C4%8Dka" title="セルボ・クロアチア語: Proljetna točka" lang="sh" hreflang="sh" data-title="Proljetna točka" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="セルボ・クロアチア語" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Bod_rovnodennosti" title="スロバキア語: Bod rovnodennosti" lang="sk" hreflang="sk" data-title="Bod rovnodennosti" data-language-autonym="Slovenčina" data-language-local-name="スロバキア語" 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/Pomladi%C5%A1%C4%8De" title="スロベニア語: Pomladišče" lang="sl" hreflang="sl" data-title="Pomladišče" data-language-autonym="Slovenščina" data-language-local-name="スロベニア語" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%93%D0%B0%D0%BC%D0%B0_%D1%82%D0%B0%D1%87%D0%BA%D0%B0" title="セルビア語: Гама тачка" lang="sr" hreflang="sr" data-title="Гама тачка" data-language-autonym="Српски / srpski" data-language-local-name="セルビア語" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a 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class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Equinox" hreflang="en"><span>コモンズ</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q80360" title="関連付けられたデータリポジトリ項目へのリンク[g]" accesskey="g"><span>ウィキデータ項目</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="表示"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">表示</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">非表示</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出典: フリー百科事典『ウィキペディア（Wikipedia）』</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ja" dir="ltr"><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Pisces_constellation_map.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Pisces_constellation_map.png/220px-Pisces_constellation_map.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Pisces_constellation_map.png/330px-Pisces_constellation_map.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d5/Pisces_constellation_map.png/440px-Pisces_constellation_map.png 2x" data-file-width="2559" data-file-height="2559" /></a><figcaption>うお座（水色の網目の交点と赤い破線との交点が春分点）</figcaption></figure> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Celestial_sphere(in_Japanese).png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/be/Celestial_sphere%28in_Japanese%29.png/380px-Celestial_sphere%28in_Japanese%29.png" decoding="async" width="380" height="272" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/b/be/Celestial_sphere%28in_Japanese%29.png 1.5x" data-file-width="480" data-file-height="343" /></a><figcaption>地球から見た<a href="/wiki/%E5%A4%A9%E7%90%83" title="天球">天球</a>上の太陽の動き</figcaption></figure> <p><b>春分点</b>（しゅんぶんてん、<a href="/wiki/%E8%8B%B1%E8%AA%9E" title="英語">英</a>: <span lang="en">vernal equinox</span>）とは、<a href="/wiki/%E9%BB%84%E9%81%93" title="黄道">黄道</a>と<a href="/wiki/%E5%A4%A9%E3%81%AE%E8%B5%A4%E9%81%93" title="天の赤道">天の赤道</a>との2つの交点（<a href="/wiki/%E5%88%86%E7%82%B9" title="分点">分点</a>）のうち、黄道が南から北へ交わる方の点（昇交点）のこと。この点が<a href="/wiki/%E8%B5%A4%E7%B5%8C" title="赤経">赤経</a>0時かつ<a href="/wiki/%E9%BB%84%E7%B5%8C" class="mw-redirect" title="黄経">黄経</a>0度であり、この点を<a href="/wiki/%E5%A4%AA%E9%99%BD" title="太陽">太陽</a>が通過する瞬間が<a href="/wiki/%E6%98%A5%E5%88%86" title="春分">春分</a>となる<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>。（公転している地球から見て、太陽が動いているということ） </p><p>春分点は<a href="/wiki/%E9%BB%84%E9%81%93%E5%BA%A7%E6%A8%99" title="黄道座標">黄道座標</a>や<a href="/wiki/%E8%B5%A4%E9%81%93%E5%BA%A7%E6%A8%99" title="赤道座標">赤道座標</a>の原点である（後述のIAU2006歳差章動理論も参照）。<a href="/wiki/%E5%A4%A9%E7%90%83" title="天球">天球</a>上における春分点の位置は、地球の<a href="/wiki/%E6%AD%B3%E5%B7%AE" title="歳差">歳差</a>によって西向きに移動する。その周期は25800年である。<a href="/wiki/%E5%A4%AA%E9%99%BD%E5%A4%AA%E9%99%B0%E6%9A%A6" class="mw-redirect" title="太陽太陰暦">太陽太陰暦</a>の<a href="/wiki/%E4%BA%8C%E5%8D%81%E5%9B%9B%E7%AF%80%E6%B0%97" title="二十四節気">二十四節気</a>の定め方のひとつである<a href="/wiki/%E5%AE%9A%E6%B0%97%E6%B3%95" title="定気法">定気法</a>でも春分点を基準とする（<a href="/wiki/%E5%B9%B3%E6%B0%97%E6%B3%95" title="平気法">平気法</a>では<a href="/wiki/%E5%86%AC%E8%87%B3" title="冬至">冬至</a>）。 </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="春分点と星座"><span id=".E6.98.A5.E5.88.86.E7.82.B9.E3.81.A8.E6.98.9F.E5.BA.A7"></span>春分点と星座</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=1" title="節を編集: 春分点と星座"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>春分点は別名を<b>白羊宮の原点</b> (the first point of Aries) ともいう。この <i>Aries</i> は<a href="/wiki/%E5%8D%81%E4%BA%8C%E5%AE%AE" class="mw-redirect" title="十二宮">黄道十二宮</a>の<a href="/wiki/%E7%99%BD%E7%BE%8A%E5%AE%AE" title="白羊宮">白羊宮</a>（黄経0°～30°）であって<a href="/wiki/%E6%98%9F%E5%BA%A7" title="星座">星座</a>の「<a href="/wiki/%E3%81%8A%E3%81%B2%E3%81%A4%E3%81%98%E5%BA%A7" title="おひつじ座">おひつじ座</a>」のことではないが、<a href="/wiki/%E7%B4%80%E5%85%83%E5%89%8D2%E4%B8%96%E7%B4%80" title="紀元前2世紀">紀元前2世紀</a>に黄道十二宮が整備されたとき、「おひつじ座」に春分点があったので、同名（欧米では星座名と十二宮名は全く同じ）の白羊宮が十二宮の起点となった。 </p><p><a href="/wiki/%E3%82%AD%E3%83%AA%E3%82%B9%E3%83%88%E6%95%99" title="キリスト教">キリスト教</a>では、「<a href="/wiki/%E3%81%86%E3%81%8A%E5%BA%A7" title="うお座">うお座</a>」を神聖な星座と考えていた。それは、'<i>Ιησους Χριστος, Θεου ‘Υιος Σωτηρ</i> （<a href="/wiki/%E3%82%AD%E3%83%AA%E3%82%B9%E3%83%88" title="キリスト">イエス・キリスト</a>、神の御子、救世主）の頭文字 Ι-Χ-Θ-Υ-Σ- を繋ぐと<a href="/wiki/%E3%82%AE%E3%83%AA%E3%82%B7%E3%82%A2%E8%AA%9E" title="ギリシア語">ギリシア語</a>で「魚」を意味する <a href="/wiki/%E3%82%A4%E3%82%AF%E3%83%88%E3%82%A5%E3%82%B9" title="イクトゥス">'ιχθυς (ichthys)</a> となることと、キリストが生まれたときに春分点が「うお座」にあったためである。なお、春分点は現在も「うお座」にある（右上図参照）。 </p> <div class="mw-heading mw-heading3"><h3 id="ニューエイジにおける主張"><span id=".E3.83.8B.E3.83.A5.E3.83.BC.E3.82.A8.E3.82.A4.E3.82.B8.E3.81.AB.E3.81.8A.E3.81.91.E3.82.8B.E4.B8.BB.E5.BC.B5"></span>ニューエイジにおける主張</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=2" title="節を編集: ニューエイジにおける主張"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading4"><h4 id="水瓶座の時代"><span id=".E6.B0.B4.E7.93.B6.E5.BA.A7.E3.81.AE.E6.99.82.E4.BB.A3"></span>水瓶座の時代</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=3" title="節を編集: 水瓶座の時代"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/%E3%83%8B%E3%83%A5%E3%83%BC%E3%82%A8%E3%82%A4%E3%82%B8" title="ニューエイジ">ニューエイジ</a>の間では、春分点の存する星座がその時代（1つの星座で約2千年）を象徴するとされる。春分点は紀元後<a href="/wiki/1%E4%B8%96%E7%B4%80" title="1世紀">1世紀</a>から<a href="/wiki/20%E4%B8%96%E7%B4%80" title="20世紀">20世紀</a>までは「うお座」にあったが、20世紀末ごろに「<a href="/wiki/%E3%81%BF%E3%81%9A%E3%81%8C%E3%82%81%E5%BA%A7" title="みずがめ座">みずがめ座</a>」に入ったとしている（現在移行中との説もある）。これを支持する論者の間で、現代は「水瓶座の時代 (the age of Aquarius)」と呼ばれている。「みずがめ座」は変革を象徴していると考えられており、何らかの世界的変革があると主張している。 </p><p>「水瓶座の時代」は一部の<a href="/wiki/%E5%8D%A0%E6%98%9F%E8%A1%93" title="占星術">占星術</a>師が持ち出したりすることもあるが、伝統的な<a href="/wiki/%E8%A5%BF%E6%B4%8B%E5%8D%A0%E6%98%9F%E8%A1%93" title="西洋占星術">西洋占星術</a>とは関係がない。実際に春分点が「みずがめ座」に入り込むのはこの主張より500年以上後のことである<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>。また、<a href="/wiki/%E5%8D%81%E4%BA%8C%E5%AE%AE" class="mw-redirect" title="十二宮">十二宮</a>と違い<a href="/wiki/%E6%98%9F%E5%BA%A7" title="星座">星座</a>の領域は不均等なので、「～座の時代」の期間は2千年とは限らないなど、十二宮と星座が混同されており、この主張は理論的に成り立たない。また、占星術における時代区分は春分点の移動とは関係がないとの主張もあるが<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>、そうなると占星術における時代区分の根拠そのものを失ってしまう。 </p><p>なお、<b>アクエリアン・エイジ</b> （Aquarian age）を直訳すると、「<a href="/wiki/%E5%AE%9D%E7%93%B6%E5%AE%AE" title="宝瓶宮">宝瓶宮</a>生まれの人の時代」という意味になる。 </p> <div class="mw-heading mw-heading2"><h2 id="IAU2006歳差章動理論"><span id="IAU2006.E6.AD.B3.E5.B7.AE.E7.AB.A0.E5.8B.95.E7.90.86.E8.AB.96"></span>IAU2006歳差章動理論</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=4" title="節を編集: IAU2006歳差章動理論"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>従来は、赤経の基準は前述のとおり<b>春分点</b>、すなわち天の赤道と黄道が交わる点を赤経0hおよび黄経0°と定めていたが、これは赤道座標系は黄道を定めなければ自分自身では基準（赤経0h）が定められないことを意味する。 </p><p>この問題に対し、<a href="/wiki/%E5%9B%BD%E9%9A%9B%E5%A4%A9%E6%96%87%E5%AD%A6%E9%80%A3%E5%90%88" title="国際天文学連合">国際天文学連合</a>は「IAU2006<a href="/wiki/%E6%AD%B3%E5%B7%AE" title="歳差">歳差</a><a href="/wiki/%E7%AB%A0%E5%8B%95" title="章動">章動</a>理論」により、ICRS（国際天文基準座標系、International Celestial Reference System）を導入して黄道がなくとも赤経を定められるようにした<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>。ICRSは、はるか遠方の電波天体（主に<a href="/wiki/%E3%82%AF%E3%82%A8%E3%83%BC%E3%82%B5%E3%83%BC" title="クエーサー">クエーサー</a>）によって定められる。この定義の変更は2009年1月1日より適用され、新理論による各天体の視黄経は旧理論より常に50ミリ秒角大きい（例えば<a href="/wiki/%E4%BA%8C%E5%8D%81%E5%9B%9B%E7%AF%80%E6%B0%97" title="二十四節気">二十四節気</a>が時間にして1.2秒早まる）。 </p> <div class="mw-heading mw-heading2"><h2 id="参考文献"><span id=".E5.8F.82.E8.80.83.E6.96.87.E7.8C.AE"></span>参考文献</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=5" title="節を編集: 参考文献"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>阿部秀典「訳者あとがき」ジャン・カレルズ (1996) 『占星術大全』、<a href="/wiki/%E9%9D%92%E5%9C%9F%E7%A4%BE" title="青土社">青土社</a>、338～342頁。</li></ul> <div class="mw-heading mw-heading2"><h2 id="注釈"><span id=".E6.B3.A8.E9.87.88"></span>注釈</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=6" title="節を編集: 注釈"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ol class="references"> <li id="cite_note-1"><b><a href="#cite_ref-1">^</a></b> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.nao.ac.jp/faq/a0301.html">質問3-1）何年後かの春分の日・秋分の日はわかるの？</a> 国立天文台、よくある質問</span> </li> <li id="cite_note-2"><b><a href="#cite_ref-2">^</a></b> <span class="reference-text">鈴木敬信 (1986) 『天文学辞典』、地人書館、225頁。</span> </li> <li id="cite_note-3"><b><a href="#cite_ref-3">^</a></b> <span class="reference-text">ウド・ベッカー（編）『図説・占星術事典』、同学社。</span> </li> <li id="cite_note-4"><b><a href="#cite_ref-4">^</a></b> <span class="reference-text"><cite class="citation web" style="font-style:normal">“<a rel="nofollow" class="external text" href="https://www.nao.ac.jp/contents/about-naoj/reports/report-naoj/11-34-2.pdf">片山他『暦象年表の改訂について』国立天文台報第11巻, 57-67 (2008)</a>”.  国立天文台. <span title="">2020年9月22日</span>閲覧。</cite></span> </li> </ol> <div class="mw-heading mw-heading2"><h2 id="関連項目"><span id=".E9.96.A2.E9.80.A3.E9.A0.85.E7.9B.AE"></span>関連項目</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E6%98%A5%E5%88%86%E7%82%B9&action=edit&section=7" title="節を編集: 関連項目"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%E6%98%A5%E5%88%86%E3%81%AE%E6%97%A5" title="春分の日">春分の日</a></li> <li><a href="/wiki/%E7%A7%8B%E5%88%86%E7%82%B9" title="秋分点">秋分点</a>－<a href="/wiki/%E7%A7%8B%E5%88%86%E3%81%AE%E6%97%A5" title="秋分の日">秋分の日</a></li> <li><a href="/wiki/%E5%A4%8F%E8%87%B3" title="夏至">夏至</a></li> <li><a href="/wiki/%E5%86%AC%E8%87%B3" title="冬至">冬至</a></li> <li><a href="/wiki/%E6%AD%B3%E5%B7%AE" title="歳差">歳差</a></li> <li><a href="/wiki/%E6%81%92%E6%98%9F%E6%99%82" title="恒星時">恒星時</a></li> <li><a href="/wiki/%E8%B5%A4%E9%81%93" title="赤道">赤道</a>－<a href="/wiki/%E5%A4%A9%E3%81%AE%E8%B5%A4%E9%81%93" title="天の赤道">天の赤道</a></li> <li><a href="/wiki/%E9%BB%84%E9%81%93" title="黄道">黄道</a>－<a href="/wiki/%E9%BB%84%E7%B5%8C" class="mw-redirect" title="黄経">黄経</a></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="">「<a dir="ltr" href="https://ja.wikipedia.org/w/index.php?title=春分点&oldid=103665368">https://ja.wikipedia.org/w/index.php?title=春分点&oldid=103665368</a>」から取得</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/%E7%89%B9%E5%88%A5:%E3%82%AB%E3%83%86%E3%82%B4%E3%83%AA" title="特別:カテゴリ">カテゴリ</a>: <ul><li><a href="/wiki/Category:%E5%A4%A9%E7%90%83%E5%BA%A7%E6%A8%99%E7%B3%BB" title="Category:天球座標系">天球座標系</a></li><li><a href="/wiki/Category:%E9%BB%84%E9%81%93" title="Category:黄道">黄道</a></li><li><a href="/wiki/Category:%E3%81%86%E3%81%8A%E5%BA%A7" title="Category:うお座">うお座</a></li><li><a href="/wiki/Category:%E5%A4%A9%E6%96%87%E5%AD%A6%E3%81%AB%E3%81%8A%E3%81%91%E3%82%8B%E6%99%82%E9%96%93" title="Category:天文学における時間">天文学における時間</a></li><li><a href="/wiki/Category:%E5%A4%A9%E6%96%87%E5%AD%A6%E3%81%AB%E9%96%A2%E3%81%99%E3%82%8B%E8%A8%98%E4%BA%8B" title="Category:天文学に関する記事">天文学に関する記事</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"> 最終更新 2025年2月8日 (土) 10:28 （日時は<a href="/wiki/%E7%89%B9%E5%88%A5:%E5%80%8B%E4%BA%BA%E8%A8%AD%E5%AE%9A#mw-prefsection-rendering" title="特別:個人設定">個人設定</a>で未設定ならば<a href="/wiki/%E5%8D%94%E5%AE%9A%E4%B8%96%E7%95%8C%E6%99%82" title="協定世界時">UTC</a>）。</li> <li id="footer-info-copyright">テキストは<a rel="nofollow" class="external text" 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