{"id":370915,"date":"2026-03-20T09:35:12","date_gmt":"2026-03-20T08:35:12","guid":{"rendered":"https:\/\/zakrasnejsivimperk.cz\/?p=370915"},"modified":"2026-03-20T09:35:40","modified_gmt":"2026-03-20T08:35:40","slug":"dnes-je-prvni-jarni-den","status":"publish","type":"post","link":"https:\/\/zakrasnejsivimperk.cz\/?p=370915","title":{"rendered":"AKTUALITY: Dnes je prvn\u00ed jarn\u00ed den"},"content":{"rendered":"

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V p\u00e1tek 20. b\u0159ezna 2026 v 15:46 nast\u00e1v\u00e1 jarn\u00ed rovnodennost. Dny se budou d\u00e1le prodlu\u017eovat a\u017e do letn\u00edho slunovratu, kter\u00fd letos nastane 21. \u010dervna. Jarn\u00ed rovnodennost nast\u00e1v\u00e1 v okam\u017eiku, kdy se st\u0159ed slune\u010dn\u00edho kotou\u010de ocitne na sv\u011btov\u00e9m rovn\u00edku a Slunce vstoup\u00ed do znamen\u00ed Berana. V tu chv\u00edli tak\u00e9 za\u010d\u00edn\u00e1 astronomick\u00e9 jaro.<\/h6>\n

\"\"Kdy\u017e vyslov\u00edme slovo rovnodennost, logicky si p\u0159edstav\u00edme, \u017ee by tedy m\u011bl b\u00fdt den stejn\u011b dlouh\u00fd jako noc. Tak to ale nen\u00ed, jedn\u00e1 se o zjednodu\u0161en\u00ed. Slune\u010dn\u00ed kotou\u010d toti\u017e nen\u00ed bodov\u00fd, nav\u00edc se v na\u0161\u00ed atmosf\u00e9\u0159e slune\u010dn\u00ed paprsky oh\u00fdbaj\u00ed. Dnes, v den \u201erovnodennosti\u201c, tak bude Slunce viditeln\u00e9 nad obzorem p\u0159ibli\u017en\u011b 12 hodin a 10 minut. Kdybychom cht\u011bli hledat rovnodennost, pak jsme ji vlastn\u011b u\u017e pro\u017eili, rovnodennosti se nejv\u00edc p\u0159ibl\u00ed\u017eil 17. b\u0159ezen 2026 – den byl dlouh\u00fd 11 hodin 58 minut, hned po n\u011bm byla d\u00e9lka dne od v\u00fdchodu po z\u00e1pad Slunce 18. b\u0159ezna 2026 – to u\u017e bylo 12 hodin 3 minuty.<\/p>\n

Mnoz\u00ed z n\u00e1s jsme se ve \u0161kole u\u010dili, \u017ee jarn\u00ed rovnodennost nast\u00e1v\u00e1 21. b\u0159ezna. U\u017e to ale neplat\u00ed (zkontrolujte d\u011btem u\u010debnice ). Ve 21. stolet\u00ed se tak stalo naposledy v roce 2011, znovu se tak stane a\u017e v roce 2102. Za zm\u011bnu data mohou p\u0159estupn\u00e9 roky. Vz\u00e1cn\u011b m\u016f\u017ee rovnodennost b\u00fdt i 19. b\u0159ezna (posledn\u00ed p\u0159\u00edpad v roce 1796, p\u0159\u00ed\u0161t\u00ed nastane v roce 2048).<\/p>\n

A jak dlouho vlastn\u011b trv\u00e1 jaro? Zem\u011b se na sv\u00e9 dr\u00e1ze kolem Slunce nepohybuje st\u00e1le stejn\u011b rychle, naopak jej\u00ed rychlost se p\u0159i ob\u011bhu kolem Slunce m\u011bn\u00ed, tak\u017ee ro\u010dn\u00ed obdob\u00ed nejsou stejn\u011b dlouh\u00e1. Jaro trv\u00e1 v pr\u016fm\u011bru 92,8 dne na severn\u00ed polokouli a 89,8 dne na ji\u017en\u00ed polokouli. Kr\u00e1sn\u00e9 jaro v\u0161em.<\/p>\n

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FB – Astronomick\u00fd \u00fastav AV \u010cR<\/a><\/strong><\/p>\n

Obr\u00e1zek: zdroj Aldebaran.cz<\/a><\/strong><\/p>\n

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