{"id":35125,"date":"2026-10-24T10:24:04","date_gmt":"2026-10-24T10:24:04","guid":{"rendered":"https:\/\/www.worldclock.com\/calculadora-de-tempo-sideral\/"},"modified":"2026-10-24T10:24:04","modified_gmt":"2026-10-24T10:24:04","slug":"calculadora-de-tempo-sideral","status":"publish","type":"page","link":"https:\/\/www.worldclock.com\/pt\/calculadora-de-tempo-sideral\/","title":{"rendered":"Calculadora de tempo sideral e data juliana"},"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\/pt\/\">Rel\u00f3gio Mundial<\/a><\/li><li><a href=\"https:\/\/www.worldclock.com\/pt\/ferramentas\/\">Ferramentas de Hor\u00e1rio<\/a><\/li><li><span aria-current=\"page\">Calculadora de tempo sideral e data juliana<\/span><\/li><\/ol><\/nav><p class=\"wc-eyebrow\"><span aria-hidden=\"true\">\ud83c\udf0c<\/span> Ferramenta gratuita<\/p><h1 class=\"wc-thero__title\">Calculadora de tempo sideral e data juliana<\/h1><p class=\"wc-thero__lead\">Tempo sideral local, tempo sideral de Greenwich, data juliana e data juliana modificada ao vivo para qualquer lugar e hor\u00e1rio.<\/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>Local<\/span><div class=\"wc-search wc-search--tool\" data-wc-search data-mode=\"add\"><input type=\"search\" placeholder=\"Pesquise uma cidade\u2026\" aria-label=\"Pesquise uma cidade\u2026\" autocomplete=\"off\"><ul class=\"wc-search__results\" hidden><\/ul><\/div><\/div><label class=\"wc-field\"><span>Longitude \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 Usar minha localiza\u00e7\u00e3o<\/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>Converter uma data<\/h2><label class=\"wc-field\"><span>Data &amp; hora (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>O que \u00e9 o tempo sideral?<\/h2><p>O tempo sideral mede a rota\u00e7\u00e3o da Terra em rela\u00e7\u00e3o \u00e0s estrelas distantes, e n\u00e3o ao sol. Um dia sideral tem cerca de <strong>23 horas, 56 minutos e 4 segundos<\/strong> \u2013 quase quatro minutos a menos que um dia solar \u2013 ent\u00e3o as estrelas nascem quatro minutos mais cedo a cada noite. Os astr\u00f4nomos usam o <strong>tempo sideral local (LST)<\/strong> para apontar telesc\u00f3pios: uma estrela est\u00e1 no ponto mais alto do c\u00e9u quando o LST \u00e9 igual \u00e0 sua ascens\u00e3o reta.<\/p><p>A <strong>Data Juliana<\/strong> \u00e9 uma contagem cont\u00ednua de dias desde o meio-dia UTC de 1\u00ba de janeiro de 4713 a.C., usada na astronomia para evitar as complica\u00e7\u00f5es do calend\u00e1rio. A <strong>Data Juliana Modificada<\/strong> (MJD) \u00e9 JD \u2212 2.400.000,5 e come\u00e7a \u00e0 meia-noite.<\/p><\/div><\/section><section class=\"wc-section wc-faq\"><h2>Perguntas frequentes<\/h2><details><summary>Como calcular o tempo sideral local?<\/summary><p>Calcule o Tempo Sideral M\u00e9dio de Greenwich a partir da Data Juliana e depois some a sua longitude em horas (longitude \u00f7 15, positiva a leste). A calculadora acima faz isso ao vivo para qualquer local.<\/p><\/details><\/section><section class=\"wc-section wc-tools-grid\"><div class=\"wc-section__head\"><h2>Mais ferramentas de hor\u00e1rio gratuitas<\/h2><a href=\"https:\/\/www.worldclock.com\/pt\/ferramentas\/\">Todas as ferramentas \u2192<\/a><\/div><div class=\"wc-toolcards\"><a class=\"wc-toolcard wc-toolcard--sun\" href=\"https:\/\/www.worldclock.com\/pt\/nascer-e-por-do-sol\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf05<\/span><span class=\"wc-toolcard__name\">Calculadora de Nascer e P\u00f4r do Sol<\/span><span class=\"wc-toolcard__desc\">Nascer do sol, p\u00f4r do sol e hora dourada.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--golden\" href=\"https:\/\/www.worldclock.com\/pt\/calculadora-de-hora-dourada\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udcf8<\/span><span class=\"wc-toolcard__name\">Calculadora de hora dourada<\/span><span class=\"wc-toolcard__desc\">A melhor luz para fotos.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moon\" href=\"https:\/\/www.worldclock.com\/pt\/fase-da-lua\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf15<\/span><span class=\"wc-toolcard__name\">Fase da Lua Hoje<\/span><span class=\"wc-toolcard__desc\">A lua de hoje e calend\u00e1rio lunar.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--fullmoon\" href=\"https:\/\/www.worldclock.com\/pt\/calendario-de-lua-cheia\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf1d<\/span><span class=\"wc-toolcard__name\">Calend\u00e1rio da Lua Cheia<\/span><span class=\"wc-toolcard__desc\">Datas e nomes das luas cheias.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moonrise\" href=\"https:\/\/www.worldclock.com\/pt\/nascer-e-por-da-lua\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf19<\/span><span class=\"wc-toolcard__name\">Nascer e P\u00f4r da Lua<\/span><span class=\"wc-toolcard__desc\">Quando a lua nasce e se p\u00f5e.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--birthmoon\" href=\"https:\/\/www.worldclock.com\/pt\/lua-no-dia-do-seu-aniversario\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf82<\/span><span class=\"wc-toolcard__name\">A Lua no Seu Anivers\u00e1rio<\/span><span class=\"wc-toolcard__desc\">A lua em qualquer data.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--astro\" href=\"https:\/\/www.worldclock.com\/pt\/calendario-astronomico\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd2d<\/span><span class=\"wc-toolcard__name\">Calend\u00e1rio Astron\u00f4mico<\/span><span class=\"wc-toolcard__desc\">Eclipses, meteoros e eventos no c\u00e9u.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--converter\" href=\"https:\/\/www.worldclock.com\/pt\/conversor-de-fuso-horario\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd01<\/span><span class=\"wc-toolcard__name\">Conversor de Fuso Hor\u00e1rio<\/span><span class=\"wc-toolcard__desc\">Converta um hor\u00e1rio entre quaisquer cidades.<\/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-35125","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\/pt\/author\/clocker\/"},"comment_info":"","_links":{"self":[{"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/pages\/35125","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/comments?post=35125"}],"version-history":[{"count":0,"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/pages\/35125\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.worldclock.com\/pt\/wp-json\/wp\/v2\/media?parent=35125"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}