{"id":47503,"date":"2026-10-26T04:19:49","date_gmt":"2026-10-26T04:19:49","guid":{"rendered":"https:\/\/www.worldclock.com\/calculator-timp-sideral\/"},"modified":"2026-10-26T04:19:49","modified_gmt":"2026-10-26T04:19:49","slug":"calculator-timp-sideral","status":"publish","type":"page","link":"https:\/\/www.worldclock.com\/ro\/calculator-timp-sideral\/","title":{"rendered":"Calculator de timp sideral \u0219i dat\u0103 iulian\u0103"},"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\/ro\/\">Ceas mondial<\/a><\/li><li><a href=\"https:\/\/www.worldclock.com\/ro\/instrumente\/\">Instrumente pentru timp<\/a><\/li><li><span aria-current=\"page\">Calculator de timp sideral \u0219i dat\u0103 iulian\u0103<\/span><\/li><\/ol><\/nav><p class=\"wc-eyebrow\"><span aria-hidden=\"true\">\ud83c\udf0c<\/span> Instrument gratuit<\/p><h1 class=\"wc-thero__title\">Calculator de timp sideral \u0219i dat\u0103 iulian\u0103<\/h1><p class=\"wc-thero__lead\">Timpul sideral local, timpul sideral Greenwich, data iulian\u0103 \u0219i data iulian\u0103 modificat\u0103, live, pentru orice loc \u0219i or\u0103.<\/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>Loca\u021bie<\/span><div class=\"wc-search wc-search--tool\" data-wc-search data-mode=\"add\"><input type=\"search\" placeholder=\"C\u0103uta\u021bi un ora\u0219\u2026\" aria-label=\"C\u0103uta\u021bi un ora\u0219\u2026\" autocomplete=\"off\"><ul class=\"wc-search__results\" hidden><\/ul><\/div><\/div><label class=\"wc-field\"><span>Longitudine \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 Folosi\u021bi loca\u021bia mea<\/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>Converti\u021bi o dat\u0103<\/h2><label class=\"wc-field\"><span>Data &amp; ora (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>Ce este timpul sideral?<\/h2><p>Timpul sideral m\u0103soar\u0103 rota\u021bia P\u0103m\u00e2ntului \u00een raport cu stelele \u00eendep\u0103rtate, nu cu Soarele. O zi sideral\u0103 dureaz\u0103 aproximativ <strong>23 de ore, 56 de minute \u0219i 4 secunde<\/strong> \u2013 cu aproape patru minute mai pu\u021bin dec\u00e2t o zi solar\u0103 \u2013, a\u0219a c\u0103 stelele r\u0103sar cu patru minute mai devreme \u00een fiecare noapte. Astronomii folosesc <strong>timpul sideral local (LST)<\/strong> pentru a orienta telescoapele: o stea se afl\u0103 cel mai sus pe cer atunci c\u00e2nd LST este egal cu ascensia ei dreapt\u0103.<\/p><p><strong>Data iulian\u0103<\/strong> este o num\u0103r\u0103toare continu\u0103 a zilelor de la amiaza UTC a zilei de 1 ianuarie 4713 \u00ee.Hr., folosit\u0103 \u00een astronomie pentru a evita complica\u021biile legate de calendar. <strong>Data iulian\u0103 modificat\u0103<\/strong> (MJD) este JD \u2212 2.400.000,5 \u0219i \u00eencepe la miezul nop\u021bii.<\/p><\/div><\/section><section class=\"wc-section wc-faq\"><h2>\u00centreb\u0103ri frecvente<\/h2><details><summary>Cum calculez timpul sideral local?<\/summary><p>Calcula\u021bi timpul sideral mediu Greenwich pornind de la data iulian\u0103, apoi ad\u0103uga\u021bi longitudinea exprimat\u0103 \u00een ore (longitudinea \u00f7 15, estul fiind pozitiv). Calculatorul de mai sus face acest lucru live pentru orice loca\u021bie.<\/p><\/details><\/section><section class=\"wc-section wc-tools-grid\"><div class=\"wc-section__head\"><h2>Mai multe instrumente gratuite pentru or\u0103<\/h2><a href=\"https:\/\/www.worldclock.com\/ro\/instrumente\/\">Toate instrumentele \u2192<\/a><\/div><div class=\"wc-toolcards\"><a class=\"wc-toolcard wc-toolcard--sun\" href=\"https:\/\/www.worldclock.com\/ro\/rasarit-apus\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf05<\/span><span class=\"wc-toolcard__name\">Calculator r\u0103s\u0103rit \u0219i apus<\/span><span class=\"wc-toolcard__desc\">R\u0103s\u0103rit, apus \u0219i ora de aur.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--golden\" href=\"https:\/\/www.worldclock.com\/ro\/calculator-ora-de-aur\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udcf8<\/span><span class=\"wc-toolcard__name\">Calculator pentru ora de aur<\/span><span class=\"wc-toolcard__desc\">Cea mai bun\u0103 lumin\u0103 pentru fotografii.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moon\" href=\"https:\/\/www.worldclock.com\/ro\/fazele-lunii\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf15<\/span><span class=\"wc-toolcard__name\">Faza lunii azi<\/span><span class=\"wc-toolcard__desc\">Luna din aceast\u0103 noapte \u0219i calendar lunar.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--fullmoon\" href=\"https:\/\/www.worldclock.com\/ro\/calendar-luna-plina\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf1d<\/span><span class=\"wc-toolcard__name\">Calendarul lunii pline<\/span><span class=\"wc-toolcard__desc\">Datele \u0219i numele lunilor pline.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moonrise\" href=\"https:\/\/www.worldclock.com\/ro\/rasaritul-apusul-lunii\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf19<\/span><span class=\"wc-toolcard__name\">R\u0103s\u0103ritul \u0219i apusul lunii<\/span><span class=\"wc-toolcard__desc\">C\u00e2nd r\u0103sare \u0219i apune luna.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--birthmoon\" href=\"https:\/\/www.worldclock.com\/ro\/faza-lunii-la-nastere\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf82<\/span><span class=\"wc-toolcard__name\">Luna de ziua dvs.<\/span><span class=\"wc-toolcard__desc\">Luna \u00een orice dat\u0103.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--astro\" href=\"https:\/\/www.worldclock.com\/ro\/calendar-astronomic\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd2d<\/span><span class=\"wc-toolcard__name\">Calendar astronomic<\/span><span class=\"wc-toolcard__desc\">Eclipse, meteori \u0219i evenimente cere\u0219ti.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--converter\" href=\"https:\/\/www.worldclock.com\/ro\/convertor-fus-orar\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd01<\/span><span class=\"wc-toolcard__name\">Convertor de fus orar<\/span><span class=\"wc-toolcard__desc\">Converti\u021bi o or\u0103 \u00eentre orice ora\u0219e.<\/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-47503","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\/ro\/author\/clocker\/"},"comment_info":"","_links":{"self":[{"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/pages\/47503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/comments?post=47503"}],"version-history":[{"count":0,"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/pages\/47503\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.worldclock.com\/ro\/wp-json\/wp\/v2\/media?parent=47503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}