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vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Κύριο μενού" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-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-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Κύριο μενού</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Κύριο μενού</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">μετακίνηση στην πλαϊνή μπάρα</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">απόκρυψη</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Πλοήγηση </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/%CE%A0%CF%8D%CE%BB%CE%B7:%CE%9A%CF%8D%CF%81%CE%B9%CE%B1" title="Επισκεφθείτε την αρχική σελίδα [z]" accesskey="z"><span>Κύρια πύλη</span></a></li><li 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class="vector-menu mw-portlet mw-portlet-Συμμετοχή" > <div class="vector-menu-heading"> Συμμετοχή </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-help" class="mw-list-item"><a href="/wiki/%CE%92%CE%B9%CE%BA%CE%B9%CF%80%CE%B1%CE%AF%CE%B4%CE%B5%CE%B9%CE%B1:%CE%92%CE%BF%CE%AE%CE%B8%CE%B5%CE%B9%CE%B1" title="Το μέρος για να βρείτε αυτό που ψάχνετε"><span>Βοήθεια</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/%CE%92%CE%B9%CE%BA%CE%B9%CF%80%CE%B1%CE%AF%CE%B4%CE%B5%CE%B9%CE%B1:%CE%A0%CF%8D%CE%BB%CE%B7_%CE%9A%CE%BF%CE%B9%CE%BD%CF%8C%CF%84%CE%B7%CF%84%CE%B1%CF%82" title="Σχετικά με το εγχείρημα, τι μπορείτε να κάνετε, πού μπορείτε να βρείτε τι"><span>Πύλη Κοινότητας</span></a></li><li id="n-pump" class="mw-list-item"><a href="/wiki/%CE%92%CE%B9%CE%BA%CE%B9%CF%80%CE%B1%CE%AF%CE%B4%CE%B5%CE%B9%CE%B1:%CE%91%CE%B3%CE%BF%CF%81%CE%AC"><span>Αγορά</span></a></li><li id="n-recentchanges" class="mw-list-item"><a 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src="/static/images/mobile/copyright/wikipedia-wordmark-el.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="Η Ελεύθερη Εγκυκλοπαίδεια" src="/static/images/mobile/copyright/wikipedia-tagline-el.svg" width="120" height="10" style="width: 7.5em; height: 0.625em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%91%CE%BD%CE%B1%CE%B6%CE%AE%CF%84%CE%B7%CF%83%CE%B7" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Αναζήτηση στη Βικιπαίδεια [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Αναζήτηση</span> </a> <div class="vector-typeahead-search-container"> <div 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user-links-collapsible-item" title="Μενού χρήστη" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_el.wikipedia.org&uselang=el"><span>Δωρεές</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%94%CE%B7%CE%BC%CE%B9%CE%BF%CF%85%CF%81%CE%B3%CE%AF%CE%B1%CE%9B%CE%BF%CE%B3%CE%B1%CF%81%CE%B9%CE%B1%CF%83%CE%BC%CE%BF%CF%8D&returnto=%CE%95%CF%80%CE%BF%CF%87%CE%AE+%28%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1%29" title="Σας ενθαρρύνουμε να δημιουργήσετε ένα λογαριασμό και να συνδεθείτε· ωστόσο, δεν είναι υποχρεωτικό"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Δημιουργία λογαριασμού</span></a></li><li id="pt-login" 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class="vector-pinnable-header-label">Περιεχόμενα</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">μετακίνηση στην πλαϊνή μπάρα</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">απόκρυψη</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">Αρχή</div> </a> </li> <li id="toc-Δείτε_ακόμη" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Δείτε_ακόμη"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Δείτε ακόμη</span> </div> </a> <ul id="toc-Δείτε_ακόμη-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Παραπομπές" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Παραπομπές"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Παραπομπές</span> </div> </a> <ul id="toc-Παραπομπές-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Εξωτερικοί_σύνδεσμοι" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Εξωτερικοί_σύνδεσμοι"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Εξωτερικοί σύνδεσμοι</span> </div> </a> <ul id="toc-Εξωτερικοί_σύνδεσμοι-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="Περιεχόμενα" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Εναλλαγή του πίνακα περιεχομένων" > <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">Εναλλαγή του πίνακα περιεχομένων</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">Εποχή (αστρονομία)</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="Μεταβείτε σε ένα λήμμα σε άλλη γλώσσα. Διαθέσιμο σε 55 γλώσσες" > <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-55" 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">55 γλώσσες</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/Epog_(sterrekunde)" title="Epog (sterrekunde) – Αφρικάανς" lang="af" hreflang="af" data-title="Epog (sterrekunde)" data-language-autonym="Afrikaans" data-language-local-name="Αφρικάανς" 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%AD%D9%82%D8%A8%D8%A9_(%D8%B9%D9%84%D9%85_%D8%A7%D9%84%D9%81%D9%84%D9%83)" title="حقبة (علم الفلك) – Αραβικά" lang="ar" hreflang="ar" data-title="حقبة (علم الفلك)" data-language-autonym="العربية" data-language-local-name="Αραβικά" 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/D%C3%B3mina_(astronom%C3%ADa)" title="Dómina (astronomía) – Αστουριανά" lang="ast" hreflang="ast" data-title="Dómina (astronomía)" data-language-autonym="Asturianu" data-language-local-name="Αστουριανά" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%AD%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%BE%D0%BC%D1%96%D1%8F)" title="Эпоха (астраномія) – Λευκορωσικά" lang="be" hreflang="be" data-title="Эпоха (астраномія)" data-language-autonym="Беларуская" data-language-local-name="Λευκορωσικά" 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%AD%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%B0%D0%BD%D0%BE%D0%BC%D1%96%D1%8F)" title="Эпоха (астраномія) – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Эпоха (астраномія)" 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-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%95%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%BD%D0%BE%D0%BC%D0%B8%D1%8F)" title="Епоха (астрономия) – Βουλγαρικά" lang="bg" hreflang="bg" data-title="Епоха (астрономия)" data-language-autonym="Български" data-language-local-name="Βουλγαρικά" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%AA%E0%A7%8D%E0%A6%B0%E0%A6%B8%E0%A6%99%E0%A7%8D%E0%A6%97%E0%A6%A4%E0%A6%BF%E0%A6%A5%E0%A6%BF_(%E0%A6%9C%E0%A7%8D%E0%A6%AF%E0%A7%8B%E0%A6%A4%E0%A6%BF%E0%A6%B0%E0%A7%8D%E0%A6%AC%E0%A6%BF%E0%A6%9C%E0%A7%8D%E0%A6%9E%E0%A6%BE%E0%A6%A8)" title="প্রসঙ্গতিথি (জ্যোতির্বিজ্ঞান) – Βεγγαλικά" lang="bn" hreflang="bn" data-title="প্রসঙ্গতিথি (জ্যোতির্বিজ্ঞান)" data-language-autonym="বাংলা" data-language-local-name="Βεγγαλικά" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Epoha_(astronomija)" title="Epoha (astronomija) – Βοσνιακά" lang="bs" hreflang="bs" data-title="Epoha (astronomija)" data-language-autonym="Bosanski" data-language-local-name="Βοσνιακά" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/%C3%88poca_(astronomia)" title="Època (astronomia) – Καταλανικά" lang="ca" hreflang="ca" data-title="Època (astronomia)" data-language-autonym="Català" data-language-local-name="Καταλανικά" 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/Ekvinokcium" title="Ekvinokcium – Τσεχικά" lang="cs" hreflang="cs" data-title="Ekvinokcium" data-language-autonym="Čeština" data-language-local-name="Τσεχικά" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Epoche_(Astronomie)" title="Epoche (Astronomie) – Γερμανικά" lang="de" hreflang="de" data-title="Epoche (Astronomie)" data-language-autonym="Deutsch" data-language-local-name="Γερμανικά" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Epoch_(astronomy)" title="Epoch (astronomy) – Αγγλικά" lang="en" hreflang="en" data-title="Epoch (astronomy)" data-language-autonym="English" data-language-local-name="Αγγλικά" 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/Epoko_(astronomio)" title="Epoko (astronomio) – Εσπεράντο" lang="eo" hreflang="eo" data-title="Epoko (astronomio)" data-language-autonym="Esperanto" data-language-local-name="Εσπεράντο" 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/%C3%89poca_(astronom%C3%ADa)" title="Época (astronomía) – Ισπανικά" lang="es" hreflang="es" data-title="Época (astronomía)" data-language-autonym="Español" data-language-local-name="Ισπανικά" 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/Garai_(astronomia)" title="Garai (astronomia) – Βασκικά" lang="eu" hreflang="eu" data-title="Garai (astronomia)" data-language-autonym="Euskara" data-language-local-name="Βασκικά" 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%85%D8%A8%D8%AF%D8%A3_(%D8%A7%D8%AE%D8%AA%D8%B1%D8%B4%D9%86%D8%A7%D8%B3%DB%8C)" title="مبدأ (اخترشناسی) – Περσικά" lang="fa" hreflang="fa" data-title="مبدأ (اخترشناسی)" data-language-autonym="فارسی" data-language-local-name="Περσικά" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Epookki_(t%C3%A4htitiede)" title="Epookki (tähtitiede) – Φινλανδικά" lang="fi" hreflang="fi" data-title="Epookki (tähtitiede)" data-language-autonym="Suomi" data-language-local-name="Φινλανδικά" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/%C3%89poque_(astronomie)" title="Époque (astronomie) – Γαλλικά" lang="fr" hreflang="fr" data-title="Époque (astronomie)" data-language-autonym="Français" data-language-local-name="Γαλλικά" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/%C3%89poca_(astronom%C3%ADa)" title="Época (astronomía) – Γαλικιανά" lang="gl" hreflang="gl" data-title="Época (astronomía)" data-language-autonym="Galego" data-language-local-name="Γαλικιανά" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%AA%D7%A7%D7%95%D7%A4%D7%AA_%D7%99%D7%99%D7%97%D7%95%D7%A1_(%D7%90%D7%A1%D7%98%D7%A8%D7%95%D7%A0%D7%95%D7%9E%D7%99%D7%94)" title="תקופת ייחוס (אסטרונומיה) – Εβραϊκά" lang="he" hreflang="he" data-title="תקופת ייחוס (אסטרונומיה)" data-language-autonym="עברית" data-language-local-name="Εβραϊκά" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AF%E0%A5%81%E0%A4%97%E0%A4%BE%E0%A4%B0%E0%A4%AE%E0%A5%8D%E0%A4%AD_(%E0%A4%96%E0%A4%97%E0%A5%8B%E0%A4%B2%E0%A4%B6%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A5%8D%E0%A4%B0)" title="युगारम्भ (खगोलशास्त्र) – Χίντι" lang="hi" hreflang="hi" data-title="युगारम्भ (खगोलशास्त्र)" data-language-autonym="हिन्दी" data-language-local-name="Χίντι" 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/Epoha_(astronomija)" title="Epoha (astronomija) – Κροατικά" lang="hr" hreflang="hr" data-title="Epoha (astronomija)" data-language-autonym="Hrvatski" data-language-local-name="Κροατικά" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B7%D5%BA%D5%B8%D5%AD%D5%A1_(%D5%A1%D5%BD%D5%BF%D5%B2%D5%A1%D5%A3%D5%AB%D5%BF%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6)" title="Էպոխա (աստղագիտություն) – Αρμενικά" lang="hy" hreflang="hy" data-title="Էպոխա (աստղագիտություն)" data-language-autonym="Հայերեն" data-language-local-name="Αρμενικά" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Epos_(astronomi)" title="Epos (astronomi) – Ινδονησιακά" lang="id" hreflang="id" data-title="Epos (astronomi)" data-language-autonym="Bahasa Indonesia" data-language-local-name="Ινδονησιακά" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Epoca_(astronomia)" title="Epoca (astronomia) – Ιταλικά" lang="it" hreflang="it" data-title="Epoca (astronomia)" data-language-autonym="Italiano" data-language-local-name="Ιταλικά" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%85%83%E6%9C%9F" title="元期 – Ιαπωνικά" lang="ja" hreflang="ja" data-title="元期" data-language-autonym="日本語" data-language-local-name="Ιαπωνικά" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%94%E1%83%9E%E1%83%9D%E1%83%A5%E1%83%90_(%E1%83%90%E1%83%A1%E1%83%A2%E1%83%A0%E1%83%9D%E1%83%9C%E1%83%9D%E1%83%9B%E1%83%98%E1%83%90)" title="ეპოქა (ასტრონომია) – Γεωργιανά" lang="ka" hreflang="ka" data-title="ეპოქა (ასტრონომია)" data-language-autonym="ქართული" data-language-local-name="Γεωργιανά" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%97%AD%EA%B8%B0%EC%A0%90" title="역기점 – Κορεατικά" lang="ko" hreflang="ko" data-title="역기점" data-language-autonym="한국어" data-language-local-name="Κορεατικά" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Epocha_(astronomia)" title="Epocha (astronomia) – Λατινικά" lang="la" hreflang="la" data-title="Epocha (astronomia)" data-language-autonym="Latina" data-language-local-name="Λατινικά" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Epoch_(Astronomie)" title="Epoch (Astronomie) – Λουξεμβουργιανά" lang="lb" hreflang="lb" data-title="Epoch (Astronomie)" data-language-autonym="Lëtzebuergesch" data-language-local-name="Λουξεμβουργιανά" 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/Epocha_(astronomija)" title="Epocha (astronomija) – Λιθουανικά" lang="lt" hreflang="lt" data-title="Epocha (astronomija)" data-language-autonym="Lietuvių" data-language-local-name="Λιθουανικά" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%95%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%BD%D0%BE%D0%BC%D0%B8%D1%98%D0%B0)" title="Епоха (астрономија) – Σλαβομακεδονικά" lang="mk" hreflang="mk" data-title="Епоха (астрономија)" data-language-autonym="Македонски" data-language-local-name="Σλαβομακεδονικά" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-mr mw-list-item"><a href="https://mr.wikipedia.org/wiki/%E0%A4%AF%E0%A5%81%E0%A4%97_(%E0%A4%96%E0%A4%97%E0%A5%8B%E0%A4%B2%E0%A4%B6%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%A4%E0%A5%8D%E0%A4%B0)" title="युग (खगोलशास्त्र) – Μαραθικά" lang="mr" hreflang="mr" data-title="युग (खगोलशास्त्र)" data-language-autonym="मराठी" data-language-local-name="Μαραθικά" class="interlanguage-link-target"><span>मराठी</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Epok_(astronomi)" title="Epok (astronomi) – Μαλαισιανά" lang="ms" hreflang="ms" data-title="Epok (astronomi)" data-language-autonym="Bahasa Melayu" data-language-local-name="Μαλαισιανά" 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/Epoche_(astronomie)" title="Epoche (astronomie) – Ολλανδικά" lang="nl" hreflang="nl" data-title="Epoche (astronomie)" data-language-autonym="Nederlands" data-language-local-name="Ολλανδικά" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Astronomisk_epoke" title="Astronomisk epoke – Νορβηγικά Νινόρσκ" lang="nn" hreflang="nn" data-title="Astronomisk epoke" data-language-autonym="Norsk nynorsk" data-language-local-name="Νορβηγικά Νινόρσκ" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Epoke_(astronomi)" title="Epoke (astronomi) – Νορβηγικά Μποκμάλ" lang="nb" hreflang="nb" data-title="Epoke (astronomi)" data-language-autonym="Norsk bokmål" data-language-local-name="Νορβηγικά Μποκμάλ" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Epoka_(astronomia)" title="Epoka (astronomia) – Πολωνικά" lang="pl" hreflang="pl" data-title="Epoka (astronomia)" data-language-autonym="Polski" data-language-local-name="Πολωνικά" 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/%C3%89poca_(astronomia)" title="Época (astronomia) – Πορτογαλικά" lang="pt" hreflang="pt" data-title="Época (astronomia)" data-language-autonym="Português" data-language-local-name="Πορτογαλικά" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Epoc%C4%83_(astronomie)" title="Epocă (astronomie) – Ρουμανικά" lang="ro" hreflang="ro" data-title="Epocă (astronomie)" data-language-autonym="Română" data-language-local-name="Ρουμανικά" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%AD%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%BD%D0%BE%D0%BC%D0%B8%D1%8F)" title="Эпоха (астрономия) – Ρωσικά" lang="ru" hreflang="ru" data-title="Эпоха (астрономия)" data-language-autonym="Русский" data-language-local-name="Ρωσικά" 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/Epoha_(astronomija)" title="Epoha (astronomija) – Σερβοκροατικά" lang="sh" hreflang="sh" data-title="Epoha (astronomija)" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Σερβοκροατικά" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Epoch_(astronomy)" title="Epoch (astronomy) – Simple English" lang="en-simple" hreflang="en-simple" data-title="Epoch (astronomy)" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Epocha_(astron%C3%B3mia)" title="Epocha (astronómia) – Σλοβακικά" lang="sk" hreflang="sk" data-title="Epocha (astronómia)" data-language-autonym="Slovenčina" data-language-local-name="Σλοβακικά" 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/Epoha_(astronomija)" title="Epoha (astronomija) – Σλοβενικά" lang="sl" hreflang="sl" data-title="Epoha (astronomija)" data-language-autonym="Slovenščina" data-language-local-name="Σλοβενικά" 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%95%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%BD%D0%BE%D0%BC%D0%B8%D1%98%D0%B0)" title="Епоха (астрономија) – Σερβικά" lang="sr" hreflang="sr" data-title="Епоха (астрономија)" data-language-autonym="Српски / srpski" data-language-local-name="Σερβικά" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Epok_(astronomi)" title="Epok (astronomi) – Σουηδικά" lang="sv" hreflang="sv" data-title="Epok (astronomi)" data-language-autonym="Svenska" data-language-local-name="Σουηδικά" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-szl mw-list-item"><a href="https://szl.wikipedia.org/wiki/Epoka_(astr%C5%8Dn%C5%8Dmij%C5%8F)" title="Epoka (astrōnōmijŏ) – Silesian" lang="szl" hreflang="szl" data-title="Epoka (astrōnōmijŏ)" data-language-autonym="Ślůnski" data-language-local-name="Silesian" class="interlanguage-link-target"><span>Ślůnski</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%95%E0%B9%89%E0%B8%99%E0%B8%A2%E0%B8%B8%E0%B8%84%E0%B8%AD%E0%B9%89%E0%B8%B2%E0%B8%87%E0%B8%AD%E0%B8%B4%E0%B8%87_(%E0%B8%94%E0%B8%B2%E0%B8%A3%E0%B8%B2%E0%B8%A8%E0%B8%B2%E0%B8%AA%E0%B8%95%E0%B8%A3%E0%B9%8C)" title="ต้นยุคอ้างอิง (ดาราศาสตร์) – Ταϊλανδικά" lang="th" hreflang="th" data-title="ต้นยุคอ้างอิง (ดาราศาสตร์)" data-language-autonym="ไทย" data-language-local-name="Ταϊλανδικά" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Devir_(astronomi)" title="Devir (astronomi) – Τουρκικά" lang="tr" hreflang="tr" data-title="Devir (astronomi)" data-language-autonym="Türkçe" data-language-local-name="Τουρκικά" 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%95%D0%BF%D0%BE%D1%85%D0%B0_(%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%BD%D0%BE%D0%BC%D1%96%D1%8F)" title="Епоха (астрономія) – Ουκρανικά" lang="uk" hreflang="uk" data-title="Епоха (астрономія)" data-language-autonym="Українська" data-language-local-name="Ουκρανικά" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Davr_(astronomiya)" title="Davr (astronomiya) – Ουζμπεκικά" lang="uz" hreflang="uz" data-title="Davr (astronomiya)" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Ουζμπεκικά" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/K%E1%BB%B7_nguy%C3%AAn_(thi%C3%AAn_v%C4%83n_h%E1%BB%8Dc)" title="Kỷ nguyên (thiên văn học) – Βιετναμικά" lang="vi" hreflang="vi" data-title="Kỷ nguyên (thiên văn học)" data-language-autonym="Tiếng Việt" data-language-local-name="Βιετναμικά" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%9B%86%E5%85%83" title="曆元 – Κινεζικά" lang="zh" hreflang="zh" data-title="曆元" data-language-autonym="中文" data-language-local-name="Κινεζικά" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E6%9B%86%E5%85%83" title="曆元 – Καντονέζικα" lang="yue" hreflang="yue" data-title="曆元" data-language-autonym="粵語" data-language-local-name="Καντονέζικα" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2703#sitelinks-wikipedia" title="Επεξεργασία διαγλωσσικών συνδέσεων" class="wbc-editpage">Επεξεργασία συνδέσμων</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Ονοματοχώροι"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)" title="Προβολή της σελίδας περιεχομένου [c]" accesskey="c"><span>Λήμμα</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a 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for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Εργαλεία</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Εργαλεία</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">μετακίνηση στην πλαϊνή μπάρα</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">απόκρυψη</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Περισσότερες επιλογές" > <div class="vector-menu-heading"> Ενέργειες </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)"><span>Ανάγνωση</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&veaction=edit" title="Επεξεργασία αυτής της σελίδας [v]" accesskey="v"><span>Επεξεργασία</span></a></li><li id="ca-more-edit" 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href="/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%A0%CE%B1%CF%81%CE%B1%CF%80%CE%BF%CE%BC%CF%80%CE%AE%CE%91%CF%85%CF%84%CE%AE%CE%A4%CE%B7%CE%A3%CE%B5%CE%BB%CE%AF%CE%B4%CE%B1&page=%CE%95%CF%80%CE%BF%CF%87%CE%AE_%28%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1%29&id=9025833&wpFormIdentifier=titleform" title="Πληροφορίες για το πώς να δημιουργήσετε παραπομπή αυτής της σελίδας"><span>Παραπομπή</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:UrlShortener&url=https%3A%2F%2Fel.wikipedia.org%2Fwiki%2F%25CE%2595%25CF%2580%25CE%25BF%25CF%2587%25CE%25AE_%28%25CE%25B1%25CF%2583%25CF%2584%25CF%2581%25CE%25BF%25CE%25BD%25CE%25BF%25CE%25BC%25CE%25AF%25CE%25B1%29"><span>Λάβετε συντομευμένη διεύθυνση URL</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:QrCode&url=https%3A%2F%2Fel.wikipedia.org%2Fwiki%2F%25CE%2595%25CF%2580%25CE%25BF%25CF%2587%25CE%25AE_%28%25CE%25B1%25CF%2583%25CF%2584%25CF%2581%25CE%25BF%25CE%25BD%25CE%25BF%25CE%25BC%25CE%25AF%25CE%25B1%29"><span>Λήψη κωδικού QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Εκτύπωση/εξαγωγή </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%A3%CF%85%CE%BB%CE%BB%CE%BF%CE%B3%CE%AE&bookcmd=book_creator&referer=%CE%95%CF%80%CE%BF%CF%87%CE%AE+%28%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1%29"><span>Δημιουργία βιβλίου</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:DownloadAsPdf&page=%CE%95%CF%80%CE%BF%CF%87%CE%AE_%28%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1%29&action=show-download-screen"><span>Κατέβασμα ως PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&printable=yes" title="Εκτυπώσιμη έκδοση αυτής της σελίδας [p]" accesskey="p"><span>Εκτυπώσιμη έκδοση</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> Σε άλλα εγχειρήματα </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q2703" title="Σύνδεσμος προς το συνδεδεμένο αντικείμενο δεδομένων [g]" accesskey="g"><span>Αντικείμενο Wikidata</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="Εργαλεία σελίδων"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Εμφάνιση"> <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">Εμφάνιση</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">μετακίνηση στην πλαϊνή μπάρα</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">απόκρυψη</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">Από τη Βικιπαίδεια, την ελεύθερη εγκυκλοπαίδεια</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="el" dir="ltr"><p>Η <b>εποχή</b> στην <a href="/wiki/%CE%91%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1" title="Αστρονομία">αστρονομία</a> είναι μια στιγμή στο χρόνο που χρησιμοποιείται ως σημείο αναφοράς για κάποια μεταβαλλόμενο χρονικό διάστημα μιας αστρονομικής ποσότητας, όπως οι <a href="/wiki/%CE%9F%CF%85%CF%81%CE%AC%CE%BD%CE%B9%CE%B5%CF%82_%CF%83%CF%85%CE%BD%CF%84%CE%B5%CF%84%CE%B1%CE%B3%CE%BC%CE%AD%CE%BD%CE%B5%CF%82" title="Ουράνιες συντεταγμένες">Ουράνιες συντεταγμένες</a> ή τα ελλειπτικά <a href="/wiki/%CE%A4%CF%81%CE%BF%CF%87%CE%B9%CE%B1%CE%BA%CE%AC_%CF%83%CF%84%CE%BF%CE%B9%CF%87%CE%B5%CE%AF%CE%B1" title="Τροχιακά στοιχεία">τροχιακά στοιχεία</a> ενός <a href="/wiki/%CE%9F%CF%85%CF%81%CE%AC%CE%BD%CE%B9%CE%BF_%CF%83%CF%8E%CE%BC%CE%B1" title="Ουράνιο σώμα">ουράνιου σώματος</a>, γιατί αυτά υπόκεινται σε <a href="/wiki/%CE%A0%CE%AC%CF%81%CE%B5%CE%BB%CE%BE%CE%B7" title="Πάρελξη">διαταραχές</a> και μεταβάλλονται με το χρόνο.<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> Οι χρονικά μεταβαλλόμενες αστρονομικές ποσότητες μπορούν να περιλαμβάνουν, για παράδειγμα, το <a href="/w/index.php?title=%CE%9C%CE%AD%CF%83%CE%BF_%CE%BC%CE%AE%CE%BA%CE%BF%CF%82&action=edit&redlink=1" class="new" title="Μέσο μήκος (δεν έχει γραφτεί ακόμα)">μέσο μήκος</a> ή τη <a href="/wiki/%CE%9C%CE%AD%CF%83%CE%B7_%CE%B1%CE%BD%CF%89%CE%BC%CE%B1%CE%BB%CE%AF%CE%B1" title="Μέση ανωμαλία">Μέση ανωμαλία</a> ενός σώματος, τον κόμβο της τροχιάς του σε σχέση με ένα επίπεδο αναφοράς, την κατεύθυνση από το <a href="/w/index.php?title=%CE%91%CF%80%CF%8C%CE%B3%CE%B5%CE%B9%CE%BF&action=edit&redlink=1" class="new" title="Απόγειο (δεν έχει γραφτεί ακόμα)">απόγειο</a> και το <a href="/wiki/%CE%91%CF%86%CE%AE%CE%BB%CE%B9%CE%BF" title="Αφήλιο">αφήλιο</a> της τροχιάς του, ή το μέγεθος του <a href="/wiki/%CE%97%CE%BC%CE%B9%CE%BC%CE%B5%CE%B3%CE%AC%CE%BB%CE%BF%CF%82_%CE%86%CE%BE%CE%BF%CE%BD%CE%B1%CF%82" title="Ημιμεγάλος Άξονας">κύριου άξονα</a> της τροχιάς του. </p><p>Η κύρια χρήση των αστρονομικών ποσοτήτων που καθορίζονται με αυτόν τον τρόπο είναι να υπολογίσουν άλλες σχετικές παραμέτρους της κίνησης, προκειμένου να γίνει πρόβλεψη για τις μελλοντικές θέσεις και τις ταχύτητες. Τα εργαλεία που εφαρμόζονται από τους κλάδους της <a href="/wiki/%CE%9F%CF%85%CF%81%CE%AC%CE%BD%CE%B9%CE%B1_%CE%BC%CE%B7%CF%87%CE%B1%CE%BD%CE%B9%CE%BA%CE%AE" title="Ουράνια μηχανική">Ουράνιας Μηχανικής</a> ή το υποπεδίο <a href="/w/index.php?title=%CE%9C%CE%B7%CF%87%CE%B1%CE%BD%CE%B9%CE%BA%CE%AE_%CF%84%CF%81%CE%BF%CF%87%CE%B9%CE%AC%CF%82&action=edit&redlink=1" class="new" title="Μηχανική τροχιάς (δεν έχει γραφτεί ακόμα)">μηχανική τροχιάς</a> (για την πρόβλεψη τροχιών και θέσεων για σώματα σε κίνηση κάτω από τις βαρυτικές επιδράσεις άλλων σωμάτων) μπορεί να χρησιμοποιηθούν για τη δημιουργία ενός <a href="/w/index.php?title=%CE%91%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%B9%CE%BA%CF%8C_%CE%B7%CE%BC%CE%B5%CF%81%CE%BF%CE%BB%CF%8C%CE%B3%CE%B9%CE%BF&action=edit&redlink=1" class="new" title="Αστρονομικό ημερολόγιο (δεν έχει γραφτεί ακόμα)">αστρονομικού ημερολογίου</a>, ενός πίνακα τιμών που δίνει τις θέσεις και τις ταχύτητες αστρονομικών αντικειμένων στον ουρανό σε μια δεδομένη στιγμή ή στιγμές. </p> <div class="mw-heading mw-heading2"><h2 id="Δείτε_ακόμη"><span id=".CE.94.CE.B5.CE.AF.CF.84.CE.B5_.CE.B1.CE.BA.CF.8C.CE.BC.CE.B7"></span>Δείτε ακόμη</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&veaction=edit&section=1" title="Επεξεργασία ενότητας: Δείτε ακόμη" class="mw-editsection-visualeditor"><span>Επεξεργασία</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&action=edit&section=1" title="Επεξεργαστείτε τον πηγαίο κώδικα της ενότητας: Δείτε ακόμη"><span>επεξεργασία κώδικα</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%CE%91%CF%83%CF%84%CF%81%CE%BF%CE%BC%CE%B5%CF%84%CF%81%CE%AF%CE%B1" title="Αστρομετρία">Αστρομετρία</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Παραπομπές"><span id=".CE.A0.CE.B1.CF.81.CE.B1.CF.80.CE.BF.CE.BC.CF.80.CE.AD.CF.82"></span>Παραπομπές</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&veaction=edit&section=2" title="Επεξεργασία ενότητας: Παραπομπές" class="mw-editsection-visualeditor"><span>Επεξεργασία</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&action=edit&section=2" title="Επεξεργαστείτε τον πηγαίο κώδικα της ενότητας: Παραπομπές"><span>επεξεργασία κώδικα</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><cite class="citation book">Soop, E. M. (1994). <i>Handbook of Geostationary Orbits</i>. Springer. <a href="/wiki/%CE%94%CE%B9%CE%B5%CE%B8%CE%BD%CE%AE%CF%82_%CF%80%CF%81%CF%8C%CF%84%CF%85%CF%80%CE%BF%CF%82_%CE%B1%CF%81%CE%B9%CE%B8%CE%BC%CF%8C%CF%82_%CE%B2%CE%B9%CE%B2%CE%BB%CE%AF%CE%BF%CF%85" title="Διεθνής πρότυπος αριθμός βιβλίου">ISBN</a> <a href="/wiki/%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%A0%CE%B7%CE%B3%CE%AD%CF%82%CE%92%CE%B9%CE%B2%CE%BB%CE%AF%CF%89%CE%BD/978-0-7923-3054-7" title="Ειδικό:ΠηγέςΒιβλίων/978-0-7923-3054-7">978-0-7923-3054-7</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Handbook+of+Geostationary+Orbits&rft.pub=Springer&rft.date=1994&rft.isbn=978-0-7923-3054-7&rft.aulast=Soop&rft.aufirst=E.+M.&rfr_id=info%3Asid%2Fel.wikipedia.org%3A%CE%95%CF%80%CE%BF%CF%87%CE%AE+%28%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1%29" class="Z3988"><span style="display:none;"> </span></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="Εξωτερικοί_σύνδεσμοι"><span id=".CE.95.CE.BE.CF.89.CF.84.CE.B5.CF.81.CE.B9.CE.BA.CE.BF.CE.AF_.CF.83.CF.8D.CE.BD.CE.B4.CE.B5.CF.83.CE.BC.CE.BF.CE.B9"></span>Εξωτερικοί σύνδεσμοι</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&veaction=edit&section=3" title="Επεξεργασία ενότητας: Εξωτερικοί σύνδεσμοι" class="mw-editsection-visualeditor"><span>Επεξεργασία</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&action=edit&section=3" title="Επεξεργαστείτε τον πηγαίο κώδικα της ενότητας: Εξωτερικοί σύνδεσμοι"><span>επεξεργασία κώδικα</span></a><span class="mw-editsection-bracket">]</span></span></div> <table role="presentation" class="noprint mbox-small" style="border:1px solid var(--border-color-base, #a2a9b1); background-color:var(--background-color-notice-subtle, #f8f9fa); color:inherit;"> <tbody><tr> <td class="mbox-image"><figure class="mw-halign-none" typeof="mw:File"><span title="wiktionary logo"><img alt="wiktionary logo" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/40px-Wiktionary-logo.svg.png" decoding="async" width="40" height="38" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/60px-Wiktionary-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/80px-Wiktionary-logo.svg.png 2x" data-file-width="370" data-file-height="350" /></span><figcaption>wiktionary logo</figcaption></figure></td> <td class="mbox-text plainlist" style="">Το <i><a href="https://el.wiktionary.org/wiki/el:" class="extiw" title="wikt:el:">Βικιλεξικό</a></i> έχει σχετικό λήμμα:<br />  <b><a href="https://el.wiktionary.org/wiki/el:%CE%B5%CF%80%CE%BF%CF%87%CE%AE" class="extiw" title="wikt:el:εποχή">εποχή </a></b></td> </tr> </tbody></table> <ul><li><span class="citation Journal">Standish, E. M., Jr. (November 1982). <a rel="nofollow" class="external text" href="https://archive.org/details/sim_astronomy-and-astrophysics_1982-11_115_1/page/20">«Conversion of positions and proper motions from B1950.0 to the IAU system at J2000.0»</a>. <i>Astronomy and Astrophysics</i> <b>115</b> (1): 20–22. <a href="/wiki/Bibcode" title="Bibcode">Bibcode</a>: <a rel="nofollow" class="external text" href="http://adsabs.harvard.edu/abs/1982A&A...115...20S">1982A&A...115...20S</a><span class="printonly">. <a rel="nofollow" class="external free" href="https://archive.org/details/sim_astronomy-and-astrophysics_1982-11_115_1/page/20">https://archive.org/details/sim_astronomy-and-astrophysics_1982-11_115_1/page/20</a></span>.</span><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Conversion+of+positions+and+proper+motions+from+B1950.0+to+the+IAU+system+at+J2000.0&rft.jtitle=Astronomy+and+Astrophysics&rft.aulast=Standish&rft.aufirst=E.+M.%2C+Jr.&rft.au=Standish%2C%26%2332%3BE.+M.%2C+Jr.&rft.date=November+1982&rft.volume=115&rft.issue=1&rft.pages=20%E2%80%9322&rft_id=info:bibcode/1982A%26A...115...20S&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fsim_astronomy-and-astrophysics_1982-11_115_1%2Fpage%2F20&rfr_id=info:sid/el.wikipedia.org:%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)"><span style="display: none;"> </span></span></li> <li><a rel="nofollow" class="external text" href="http://aa.usno.navy.mil/faq/docs/TT.html">What is Terrestrial Time?</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20060806040555/http://aa.usno.navy.mil/faq/docs/TT.html">Αρχειοθετήθηκε</a> 2006-08-06 στο <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. - U.S. Naval Observatory</li> <li><a rel="nofollow" class="external text" href="http://aa.usno.navy.mil/faq/docs/ICRS_doc.html">International Celestial Reference System, or ICRS</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20060805073908/http://aa.usno.navy.mil/faq/docs/ICRS_doc.html">Αρχειοθετήθηκε</a> 2006-08-05 στο <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>. - U.S. Naval Observatory</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20090131124845/http://www.iers.org/MainDisp.csl?pid=46-25776">IERS Conventions 2003 (defines ICRS and other related standards)</a></li></ul> <table class="metadata plainlinks stub" style="background: transparent;" role="presentation"><tbody><tr> <td><span typeof="mw:File"><a href="/wiki/%CE%91%CF%81%CF%87%CE%B5%CE%AF%CE%BF:Saturn_template.svg" class="mw-file-description"><img alt="Stub icon" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Saturn_template.svg/30px-Saturn_template.svg.png" decoding="async" width="30" height="30" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Saturn_template.svg/45px-Saturn_template.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/df/Saturn_template.svg/60px-Saturn_template.svg.png 2x" data-file-width="50" data-file-height="50" /></a></span></td> <td><i>Αυτό το λήμμα σχετικά με την <b><a href="/wiki/%CE%91%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1" title="Αστρονομία">αστρονομία</a></b> χρειάζεται <a href="/wiki/%CE%92%CE%B9%CE%BA%CE%B9%CF%80%CE%B1%CE%AF%CE%B4%CE%B5%CE%B9%CE%B1:%CE%9B%CE%AE%CE%BC%CE%BC%CE%B1%CF%84%CE%B1_%CF%80%CF%81%CE%BF%CF%82_%CE%B5%CF%80%CE%AD%CE%BA%CF%84%CE%B1%CF%83%CE%B7" title="Βικιπαίδεια:Λήμματα προς επέκταση">επέκταση</a>. Μπορείτε να βοηθήσετε την Βικιπαίδεια <a class="external text" href="https://el.wikipedia.org/w/index.php?title=%CE%95%CF%80%CE%BF%CF%87%CE%AE_(%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1)&action=edit">επεκτείνοντάς το</a>.</i></td> </tr></tbody></table>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Ανακτήθηκε από "<a dir="ltr" href="https://el.wikipedia.org/w/index.php?title=Εποχή_(αστρονομία)&oldid=9025833">https://el.wikipedia.org/w/index.php?title=Εποχή_(αστρονομία)&oldid=9025833</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/%CE%95%CE%B9%CE%B4%CE%B9%CE%BA%CF%8C:%CE%9A%CE%B1%CF%84%CE%B7%CE%B3%CE%BF%CF%81%CE%AF%CE%B5%CF%82" title="Ειδικό:Κατηγορίες">Κατηγορίες</a>: <ul><li><a href="/wiki/%CE%9A%CE%B1%CF%84%CE%B7%CE%B3%CE%BF%CF%81%CE%AF%CE%B1:%CE%A7%CF%81%CF%8C%CE%BD%CE%BF%CF%82_%CF%83%CF%84%CE%B7%CE%BD_%CE%B1%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1" title="Κατηγορία:Χρόνος στην αστρονομία">Χρόνος στην αστρονομία</a></li><li><a href="/wiki/%CE%9A%CE%B1%CF%84%CE%B7%CE%B3%CE%BF%CF%81%CE%AF%CE%B1:%CE%9F%CF%85%CF%81%CE%AC%CE%BD%CE%B9%CE%BF_%CF%83%CF%8D%CF%83%CF%84%CE%B7%CE%BC%CE%B1_%CF%83%CF%85%CE%BD%CF%84%CE%B5%CF%84%CE%B1%CE%B3%CE%BC%CE%AD%CE%BD%CF%89%CE%BD" title="Κατηγορία:Ουράνιο σύστημα συντεταγμένων">Ουράνιο σύστημα συντεταγμένων</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Κρυμμένες κατηγορίες: <ul><li><a href="/wiki/%CE%9A%CE%B1%CF%84%CE%B7%CE%B3%CE%BF%CF%81%CE%AF%CE%B1:%CE%A3%CF%8D%CE%BD%CE%B4%CE%B5%CF%83%CE%BC%CE%BF%CE%B9_wayback_%CF%80%CF%81%CE%BF%CF%84%CF%8D%CF%80%CE%BF%CF%85_Webarchive" title="Κατηγορία:Σύνδεσμοι wayback προτύπου Webarchive">Σύνδεσμοι wayback προτύπου Webarchive</a></li><li><a href="/wiki/%CE%9A%CE%B1%CF%84%CE%B7%CE%B3%CE%BF%CF%81%CE%AF%CE%B1:%CE%91%CF%83%CF%84%CF%81%CE%BF%CE%BD%CE%BF%CE%BC%CE%AF%CE%B1-%CE%B5%CF%80%CE%AD%CE%BA%CF%84%CE%B1%CF%83%CE%B7" title="Κατηγορία:Αστρονομία-επέκταση">Αστρονομία-επέκταση</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"> Τελευταία τροποποίηση 11:02, 30 Αυγούστου 2021.</li> <li id="footer-info-copyright">Όλα τα κείμενα είναι διαθέσιμα υπό την <a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/deed.el">Creative Commons Attribution-ShareAlike License</a>· μπορεί να ισχύουν και πρόσθετοι όροι. 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