{"id":29133,"date":"2026-10-23T08:36:19","date_gmt":"2026-10-23T08:36:19","guid":{"rendered":"https:\/\/www.worldclock.com\/sternzeit-rechner\/"},"modified":"2026-10-23T08:36:19","modified_gmt":"2026-10-23T08:36:19","slug":"sternzeit-rechner","status":"publish","type":"page","link":"https:\/\/www.worldclock.com\/de\/sternzeit-rechner\/","title":{"rendered":"Rechner f\u00fcr Sternzeit &#038; Julianisches Datum"},"content":{"rendered":"<div class=\"wc wc-tool-page wc-tool-page--sidereal\"><header class=\"wc-thero\"><div class=\"wc-thero__text\"><nav class=\"wc-crumbs\" aria-label=\"Breadcrumb\"><ol><li><a href=\"https:\/\/www.worldclock.com\/de\/\">Weltuhr<\/a><\/li><li><a href=\"https:\/\/www.worldclock.com\/de\/tools\/\">Zeit-Tools<\/a><\/li><li><span aria-current=\"page\">Rechner f\u00fcr Sternzeit &amp; Julianisches Datum<\/span><\/li><\/ol><\/nav><p class=\"wc-eyebrow\"><span aria-hidden=\"true\">\ud83c\udf0c<\/span> Kostenloses Tool<\/p><h1 class=\"wc-thero__title\">Rechner f\u00fcr Sternzeit &amp; Julianisches Datum<\/h1><p class=\"wc-thero__lead\">Live: lokale Sternzeit, Greenwich-Sternzeit, Julianisches Datum und Modifiziertes Julianisches Datum f\u00fcr jeden Ort und jede Uhrzeit.<\/p><\/div><\/header><div class=\"wc-tool\"><div class=\"wc-sid\" data-wc-tool=\"sidereal\" data-default=\"{&quot;n&quot;:&quot;Greenwich&quot;,&quot;t&quot;:&quot;Europe\\\/London&quot;,&quot;f&quot;:&quot;gb&quot;,&quot;a&quot;:51.4769,&quot;o&quot;:-0.0005}\"><div class=\"wc-tbar\"><div class=\"wc-field wc-field--grow\"><span>Standort<\/span><div class=\"wc-search wc-search--tool\" data-wc-search data-mode=\"add\"><input type=\"search\" placeholder=\"Stadt suchen\u2026\" aria-label=\"Stadt suchen\u2026\" autocomplete=\"off\"><ul class=\"wc-search__results\" hidden><\/ul><\/div><\/div><label class=\"wc-field\"><span>L\u00e4ngengrad \u00b0<\/span><input type=\"number\" step=\"0.0001\" min=\"-180\" max=\"180\" data-lng><\/label><button type=\"button\" class=\"wc-btn wc-btn--ghost\" data-geo>\ud83d\udccd Meinen Standort verwenden<\/button><\/div><div class=\"wc-sunc__place\" data-place><\/div><div class=\"wc-sunc__cards\" data-cards><\/div><div class=\"wc-panel\" style=\"margin-top:16px\"><h2>Datum umrechnen<\/h2><label class=\"wc-field\"><span>Datum &amp; Uhrzeit (UTC)<\/span><input type=\"datetime-local\" step=\"1\" data-dt><\/label><dl class=\"wc-unix__out\" data-out><\/dl><\/div><\/div><\/div><section class=\"wc-section wc-tool-info\"><div class=\"wc-prose\"><h2>Was ist Sternzeit?<\/h2><p>Die Sternzeit misst die Erdrotation relativ zu den fernen Sternen statt zur Sonne. Ein Sterntag dauert etwa <strong>23 Stunden, 56 Minuten und 4 Sekunden<\/strong> \u2013 fast vier Minuten k\u00fcrzer als ein Sonnentag \u2013, daher gehen die Sterne jede Nacht vier Minuten fr\u00fcher auf. Astronomen nutzen die <strong>lokale Sternzeit (LST)<\/strong>, um Teleskope auszurichten: Ein Stern steht am h\u00f6chsten am Himmel, wenn die LST seiner Rektaszension entspricht.<\/p><p>Das <strong>Julianische Datum<\/strong> ist eine fortlaufende Tagesz\u00e4hlung seit dem 1. Januar 4713 v. Chr., 12:00 Uhr UTC, und wird in der Astronomie verwendet, um Kalenderprobleme zu vermeiden. Das <strong>Modifizierte Julianische Datum<\/strong> (MJD) ist JD \u2212 2.400.000,5 und beginnt um Mitternacht.<\/p><\/div><\/section><section class=\"wc-section wc-faq\"><h2>H\u00e4ufig gestellte Fragen<\/h2><details><summary>Wie berechne ich die lokale Sternzeit?<\/summary><p>Bestimmen Sie aus dem Julianischen Datum die mittlere Greenwich-Sternzeit und addieren Sie dann Ihren L\u00e4ngengrad in Stunden (L\u00e4ngengrad \u00f7 15, Osten positiv). Der Rechner oben erledigt das live f\u00fcr jeden Ort.<\/p><\/details><\/section><section class=\"wc-section wc-tools-grid\"><div class=\"wc-section__head\"><h2>Weitere kostenlose Zeit-Tools<\/h2><a href=\"https:\/\/www.worldclock.com\/de\/tools\/\">Alle Tools \u2192<\/a><\/div><div class=\"wc-toolcards\"><a class=\"wc-toolcard wc-toolcard--sun\" href=\"https:\/\/www.worldclock.com\/de\/sonnenaufgang-sonnenuntergang\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf05<\/span><span class=\"wc-toolcard__name\">Sonnenaufgang- &amp; Sonnenuntergang-Rechner<\/span><span class=\"wc-toolcard__desc\">Sonnenaufgang, Sonnenuntergang und goldene Stunde.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--golden\" href=\"https:\/\/www.worldclock.com\/de\/goldene-stunde-rechner\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udcf8<\/span><span class=\"wc-toolcard__name\">Goldene-Stunde-Rechner<\/span><span class=\"wc-toolcard__desc\">Bestes Licht f\u00fcr Fotos.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moon\" href=\"https:\/\/www.worldclock.com\/de\/mondphase\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf15<\/span><span class=\"wc-toolcard__name\">Mondphase heute<\/span><span class=\"wc-toolcard__desc\">Der Mond heute &amp; Mondkalender.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--fullmoon\" href=\"https:\/\/www.worldclock.com\/de\/vollmondkalender\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf1d<\/span><span class=\"wc-toolcard__name\">Vollmondkalender<\/span><span class=\"wc-toolcard__desc\">Vollmond-Termine &amp; Namen.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moonrise\" href=\"https:\/\/www.worldclock.com\/de\/mondaufgang-monduntergang\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf19<\/span><span class=\"wc-toolcard__name\">Mondaufgang &amp; Monduntergang<\/span><span class=\"wc-toolcard__desc\">Wann der Mond auf- &amp; untergeht.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--birthmoon\" href=\"https:\/\/www.worldclock.com\/de\/mondphase-geburtstag\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf82<\/span><span class=\"wc-toolcard__name\">Der Mond an Ihrem Geburtstag<\/span><span class=\"wc-toolcard__desc\">Der Mond an jedem Datum.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--astro\" href=\"https:\/\/www.worldclock.com\/de\/astronomie-kalender\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd2d<\/span><span class=\"wc-toolcard__name\">Astronomie-Kalender<\/span><span class=\"wc-toolcard__desc\">Finsternisse, Meteore &amp; Himmelsereignisse.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--converter\" href=\"https:\/\/www.worldclock.com\/de\/zeitzonenrechner\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd01<\/span><span class=\"wc-toolcard__name\">Zeitzonenrechner<\/span><span class=\"wc-toolcard__desc\">Uhrzeit zwischen beliebigen St\u00e4dten umrechnen.<\/span><\/a><\/div><\/section><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":"","bs_cache_bypass_cache":0,"bs_cache_related_page":0},"class_list":["post-29133","page","type-page","status-publish","hentry"],"acf":[],"taxonomy_info":[],"featured_image_src_large":false,"author_info":{"display_name":"clocker","author_link":"https:\/\/www.worldclock.com\/de\/author\/clocker\/"},"comment_info":"","_links":{"self":[{"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/pages\/29133","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/comments?post=29133"}],"version-history":[{"count":0,"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/pages\/29133\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.worldclock.com\/de\/wp-json\/wp\/v2\/media?parent=29133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}