{"id":236084,"date":"2021-09-21T12:31:54","date_gmt":"2021-09-21T11:31:54","guid":{"rendered":"http:\/\/zakrasnejsivimperk.cz\/?p=236084"},"modified":"2021-09-21T12:33:00","modified_gmt":"2021-09-21T11:33:00","slug":"astronomicky-ustav-av-cr-skonci-astronomicke-leto-zacne-astronomicky-podzim","status":"publish","type":"post","link":"https:\/\/zakrasnejsivimperk.cz\/?p=236084","title":{"rendered":"ASTRONOMICK\u00dd \u00daSTAV: Skon\u010d\u00ed astronomick\u00e9 l\u00e9to, za\u010dne astronomick\u00fd podzim"},"content":{"rendered":"

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Ve st\u0159edu 22. z\u00e1\u0159\u00ed ve 21:21 SEL\u010c (tedy toho \u010dasu, kter\u00fd aktu\u00e1ln\u011b pou\u017e\u00edv\u00e1me) vstoup\u00ed Slunce do znamen\u00ed Vah, nastane podzimn\u00ed rovnodennost a za\u010dne tak astronomick\u00fd podzim. Ale aby to nebylo jen such\u00e9 konstatov\u00e1n\u00ed … k ve\u010dern\u00edmu p\u0159\u00edpitku si m\u016f\u017eete p\u0159e\u010d\u00edst v\u00edce.<\/h6>\n

Ve \u0161kole se leckdo z n\u00e1s u\u010dil, \u017ee podzim za\u010d\u00edn\u00e1 23. z\u00e1\u0159\u00ed. V druh\u00e9 polovin\u011b minul\u00e9ho stolet\u00ed tomu tak i v\u011bt\u0161inou bylo. Data za\u010d\u00e1tku ro\u010dn\u00edch obdob\u00ed se ale m\u011bn\u00ed. N\u00e1\u0161 kalend\u00e1\u0159n\u00ed rok toti\u017e nen\u00ed celistv\u00fdm n\u00e1sobkem dn\u00ed, a proto je t\u0159eba zav\u00e1d\u011bt p\u0159estupn\u00e9 roky, kdy si do kalend\u00e1\u0159e p\u0159id\u00e1v\u00e1me jeden den nav\u00edc. Proto se den podzimn\u00ed rovnodennosti (a v\u016fbec v\u0161ech okam\u017eik\u016f za\u010d\u00e1tk\u016f nov\u00fdch ro\u010dn\u00edch dob) m\u011bn\u00ed.<\/p>\n

Slovo \u201erovnodennost\u201c nazna\u010duje, \u017ee den by m\u011bl b\u00fdt stejn\u011b dlouh\u00fd jako noc. Jen\u017ee to tak nen\u00ed. V den rovnodennosti jsou den a noc stejn\u011b dlouh\u00e9 jen p\u0159ibli\u017en\u011b. Slune\u010dn\u00ed kotou\u010d nen\u00ed bod a jeho paprsky se nav\u00edc v atmosf\u00e9\u0159e oh\u00fdbaj\u00ed (\u0159\u00edk\u00e1me tomu refrakce), tak\u017ee v den rovnodennosti je Slunce viditeln\u00e9 nad obzorem p\u0159ibli\u017en\u011b 12 hodin a 10 minut, pod obzorem je jen 11 hodin a 50 minut. Problematika je ale je\u0161t\u011b slo\u017eit\u011bj\u0161\u00ed, faktor\u016f, kter\u00e9 ovliv\u0148uj\u00ed d\u00e9lku dne a noci, je hned n\u011bkolik.<\/p>\n

V\u00edce https:\/\/www.aldebaran.cz\/bulletin\/2016_34_equ.php<\/strong><\/a> (v \u010dl\u00e1nku sje\u010fte n\u00ed\u017ee).
\nObr\u00e1zek: Aldebaran.cz<\/p>\n

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

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