{"id":56466,"date":"2026-11-08T00:40:05","date_gmt":"2026-11-08T00:40:05","guid":{"rendered":"https:\/\/www.worldclock.com\/kalkulacka-hviezdneho-casu\/"},"modified":"2026-11-08T00:40:05","modified_gmt":"2026-11-08T00:40:05","slug":"kalkulacka-hviezdneho-casu","status":"publish","type":"page","link":"https:\/\/www.worldclock.com\/sk\/kalkulacka-hviezdneho-casu\/","title":{"rendered":"Kalkula\u010dka hviezdneho \u010dasu a juli\u00e1nskeho d\u00e1tumu"},"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\/sk\/\">Svetov\u00fd \u010das<\/a><\/li><li><a href=\"https:\/\/www.worldclock.com\/sk\/nastroje\/\">\u010casov\u00e9 n\u00e1stroje<\/a><\/li><li><span aria-current=\"page\">Kalkula\u010dka hviezdneho \u010dasu a juli\u00e1nskeho d\u00e1tumu<\/span><\/li><\/ol><\/nav><p class=\"wc-eyebrow\"><span aria-hidden=\"true\">\ud83c\udf0c<\/span> Bezplatn\u00fd n\u00e1stroj<\/p><h1 class=\"wc-thero__title\">Kalkula\u010dka hviezdneho \u010dasu a juli\u00e1nskeho d\u00e1tumu<\/h1><p class=\"wc-thero__lead\">\u017div\u00fd miestny hviezdny \u010das, greenwichsk\u00fd hviezdny \u010das, juli\u00e1nsky d\u00e1tum a modifikovan\u00fd juli\u00e1nsky d\u00e1tum pre \u013eubovo\u013en\u00e9 miesto a \u010das.<\/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>Poloha<\/span><div class=\"wc-search wc-search--tool\" data-wc-search data-mode=\"add\"><input type=\"search\" placeholder=\"H\u013eada\u0165 mesto\u2026\" aria-label=\"H\u013eada\u0165 mesto\u2026\" autocomplete=\"off\"><ul class=\"wc-search__results\" hidden><\/ul><\/div><\/div><label class=\"wc-field\"><span>Zemepisn\u00e1 d\u013a\u017eka \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 Pou\u017ei\u0165 moju polohu<\/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>Previes\u0165 d\u00e1tum<\/h2><label class=\"wc-field\"><span>D\u00e1tum a \u010das (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>\u010co je hviezdny \u010das?<\/h2><p>Hviezdny \u010das meria rot\u00e1ciu Zeme vzh\u013eadom na vzdialen\u00e9 hviezdy, nie na Slnko. Hviezdny de\u0148 trv\u00e1 asi <strong>23 hod\u00edn 56 min\u00fat 4 sekundy<\/strong> \u2013 takmer o \u0161tyri min\u00faty menej ako slne\u010dn\u00fd de\u0148 \u2013, tak\u017ee hviezdy vych\u00e1dzaj\u00fa ka\u017ed\u00fa noc o \u0161tyri min\u00faty sk\u00f4r. Astron\u00f3movia pou\u017e\u00edvaj\u00fa <strong>miestny hviezdny \u010das (LST)<\/strong> na nasmerovanie \u010falekoh\u013eadov: hviezda je na oblohe najvy\u0161\u0161ie, ke\u010f sa LST rovn\u00e1 jej rektascenzii.<\/p><p><strong>Juli\u00e1nsky d\u00e1tum<\/strong> je priebe\u017en\u00fd po\u010det dn\u00ed od poludnia UTC 1. janu\u00e1ra 4713 pred n. l., ktor\u00fd sa v astron\u00f3mii pou\u017e\u00edva, aby sa predi\u0161lo komplik\u00e1ci\u00e1m s kalend\u00e1rom. <strong>Modifikovan\u00fd juli\u00e1nsky d\u00e1tum<\/strong> (MJD) je JD \u2212 2 400 000,5 a za\u010d\u00edna o polnoci.<\/p><\/div><\/section><section class=\"wc-section wc-faq\"><h2>\u010casto kladen\u00e9 ot\u00e1zky<\/h2><details><summary>Ako vypo\u010d\u00edta\u0165 miestny hviezdny \u010das?<\/summary><p>Z juli\u00e1nskeho d\u00e1tumu vypo\u010d\u00edtajte greenwichsk\u00fd stredn\u00fd hviezdny \u010das a pripo\u010d\u00edtajte svoju zemepisn\u00fa d\u013a\u017eku v hodin\u00e1ch (d\u013a\u017eka \u00f7 15, v\u00fdchodn\u00e1 kladn\u00e1). Kalkula\u010dka vy\u0161\u0161ie to rob\u00ed na\u017eivo pre \u013eubovo\u013en\u00e9 miesto.<\/p><\/details><\/section><section class=\"wc-section wc-tools-grid\"><div class=\"wc-section__head\"><h2>\u010eal\u0161ie bezplatn\u00e9 \u010dasov\u00e9 n\u00e1stroje<\/h2><a href=\"https:\/\/www.worldclock.com\/sk\/nastroje\/\">V\u0161etky n\u00e1stroje \u2192<\/a><\/div><div class=\"wc-toolcards\"><a class=\"wc-toolcard wc-toolcard--sun\" href=\"https:\/\/www.worldclock.com\/sk\/vychod-a-zapad-slnka\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf05<\/span><span class=\"wc-toolcard__name\">V\u00fdchod a z\u00e1pad slnka<\/span><span class=\"wc-toolcard__desc\">V\u00fdchod, z\u00e1pad slnka a zlat\u00e1 hodinka.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--golden\" href=\"https:\/\/www.worldclock.com\/sk\/kalkulacka-zlatej-hodinky\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udcf8<\/span><span class=\"wc-toolcard__name\">Kalkula\u010dka zlatej hodinky<\/span><span class=\"wc-toolcard__desc\">Najlep\u0161ie svetlo na fotky.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moon\" href=\"https:\/\/www.worldclock.com\/sk\/faza-mesiaca\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf15<\/span><span class=\"wc-toolcard__name\">F\u00e1za Mesiaca dnes<\/span><span class=\"wc-toolcard__desc\">Dne\u0161n\u00fd Mesiac a mesa\u010dn\u00fd kalend\u00e1r.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--fullmoon\" href=\"https:\/\/www.worldclock.com\/sk\/kalendar-splnov\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf1d<\/span><span class=\"wc-toolcard__name\">Kalend\u00e1r splnov<\/span><span class=\"wc-toolcard__desc\">D\u00e1tumy a n\u00e1zvy splnov.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--moonrise\" href=\"https:\/\/www.worldclock.com\/sk\/vychod-a-zapad-mesiaca\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf19<\/span><span class=\"wc-toolcard__name\">V\u00fdchod a z\u00e1pad Mesiaca<\/span><span class=\"wc-toolcard__desc\">Kedy Mesiac vych\u00e1dza a zapad\u00e1.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--birthmoon\" href=\"https:\/\/www.worldclock.com\/sk\/mesiac-v-den-narodenin\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83c\udf82<\/span><span class=\"wc-toolcard__name\">Mesiac v de\u0148 va\u0161ich naroden\u00edn<\/span><span class=\"wc-toolcard__desc\">Mesiac v \u013eubovo\u013en\u00fd de\u0148.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--astro\" href=\"https:\/\/www.worldclock.com\/sk\/astronomicky-kalendar\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd2d<\/span><span class=\"wc-toolcard__name\">Astronomick\u00fd kalend\u00e1r<\/span><span class=\"wc-toolcard__desc\">Zatmenia, meteory a \u00fakazy na oblohe.<\/span><\/a><a class=\"wc-toolcard wc-toolcard--converter\" href=\"https:\/\/www.worldclock.com\/sk\/prevodnik-casovych-pasiem\/\"><span class=\"wc-toolcard__icon\" aria-hidden=\"true\">\ud83d\udd01<\/span><span class=\"wc-toolcard__name\">Prevodn\u00edk \u010dasov\u00fdch p\u00e1siem<\/span><span class=\"wc-toolcard__desc\">Preve\u010fte \u010das medzi \u013eubovo\u013en\u00fdmi mestami.<\/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-56466","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\/sk\/author\/clocker\/"},"comment_info":"","_links":{"self":[{"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/pages\/56466","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/comments?post=56466"}],"version-history":[{"count":0,"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/pages\/56466\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.worldclock.com\/sk\/wp-json\/wp\/v2\/media?parent=56466"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}