{"id":203703,"date":"2020-09-21T18:39:29","date_gmt":"2020-09-21T17:39:29","guid":{"rendered":"http:\/\/zakrasnejsivimperk.cz\/?p=203703"},"modified":"2020-09-21T19:37:47","modified_gmt":"2020-09-21T18:37:47","slug":"atronomicky-ustav-akademie-ved-cr-nastava-podzimni-rovnodennost","status":"publish","type":"post","link":"https:\/\/zakrasnejsivimperk.cz\/?p=203703","title":{"rendered":"ATRONOMICK\u00dd \u00daSTAV AKADEMIE V\u011aD \u010cR: Nast\u00e1v\u00e1 podzimn\u00ed rovnodennost"},"content":{"rendered":"
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Ilustra\u010dn\u00ed foto: pixabay<\/figcaption><\/figure>\n

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Podzimn\u00ed rovnodennost letos nast\u00e1v\u00e1 v \u00fater\u00fd 22. z\u00e1\u0159\u00ed v 15:31 st\u0159edoevropsk\u00e9ho\u00a0letn\u00edho \u010dasu. Za\u010dne tak astronomick\u00fd podzim, kter\u00fd potrv\u00e1 do zimn\u00edho slunovratu, kter\u00fd nastane 21. prosince. Dny se tak budou d\u00e1le zkracovat.<\/h6>\n
\"\"Zat\u00edmco p\u0159i rovnodennosti\u00a0jsou den a noc stejn\u011b dlouh\u00e9 (pozn.: zjednodu\u0161en\u011b, pokud zanedb\u00e1me refrakci), do zimn\u00edho slunovratu se den zkr\u00e1t\u00ed\u00a0o \u010dty\u0159i hodiny. P\u0159i rovnodennosti Slunce vych\u00e1z\u00ed p\u0159esn\u011b na v\u00fdchod\u011b a zapad\u00e1 p\u0159esn\u011b na z\u00e1pad\u011b.<\/div>\n<\/div>\n
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Podzimn\u00ed rovnodennost, p\u0159\u00edrodn\u00ed z\u00e1kony a um\u011bn\u00ed 22. 9. 2020 na jednom m\u00edst\u011b<\/b><\/p>\n

Na observato\u0159i Astronomick\u00e9ho \u00fastavu AV \u010cR v Ond\u0159ejov\u011b, kter\u00e1 je nejen hv\u011bzd\u00e1rnou, ale tak\u00e9 p\u011bkn\u011b upraven\u00fdm arboretem s \u0159adou vz\u00e1cn\u00fdch d\u0159evin a velmi malebn\u00fdm m\u00edstem, byly v letech 1998 – 2001 v r\u00e1mci projektu Kameny a hv\u011bzdy instalov\u00e1ny kamenn\u00e9 skulptury. Jedna z nich nese n\u00e1zev Od slunovratu ke slunovratu (autor Zdenek H\u016fla – \u017eula, 260 x 32 x 44 cm, 1998). Tato \u017eulov\u00e1 skulptura po\u010d\u00edt\u00e1 s \u00fa\u010dinkem pronikaj\u00edc\u00edho slune\u010dn\u00edho sv\u011btla v p\u0159irozen\u00e9m ro\u010dn\u00edm cyklu.<\/p>\n

Pr\u00e1v\u011b v dob\u011b letn\u00edho i zimn\u00edho slunovratu a jarn\u00ed i podzimn\u00ed rovnodennosti je zde mo\u017en\u00e9 spat\u0159it pr\u016fnik slune\u010dn\u00edho paprsku. Skulptura \u00a0m\u00e1 \u00a0jeden \u00a0vertik\u00e1ln\u00ed \u0159ez a t\u0159i horizont\u00e1ln\u00ed z\u00e1\u0159ezy.\u00a0 V m\u00edstech, \u00a0kde se setk\u00e1vaj\u00ed, pronikne \u00a0slune\u010dn\u00ed paprsek otvory v k\u0159\u00ed\u017een\u00ed v prav\u00e9 poledne v den, kdy nast\u00e1v\u00e1 za\u010d\u00e1tek dal\u0161\u00edho ro\u010dn\u00edho obdob\u00ed. A pro\u010d jenom t\u0159i horizont\u00e1ln\u00ed z\u00e1\u0159ezy, kdy\u017e ro\u010dn\u00ed obdob\u00ed m\u00e1me \u010dty\u0159i? P\u0159ece proto, \u017ee v\u00fd\u0161ka Slunce v prav\u00e9 poledne je v dob\u011b podzimn\u00ed, ale i jarn\u00ed rovnodennosti stejn\u00e1.<\/p>\n

V p\u0159\u00edpad\u011b jasn\u00e9ho po\u010das\u00ed je mo\u017en\u00e9 se do Ond\u0159ejova p\u0159ijet pod\u00edvat. V \u00fater\u00fd 22. z\u00e1\u0159\u00ed 2020, tedy v den leto\u0161n\u00ed podzimn\u00ed rovnodennosti, nast\u00e1v\u00e1 prav\u00e9 poledne ve 12:52:34 st\u0159edoevropsk\u00e9ho letn\u00edho \u010dasu (tedy toho, kter\u00fd aktu\u00e1ln\u011b pou\u017e\u00edv\u00e1me). Kamenn\u00e1 skulptura se nach\u00e1z\u00ed v historick\u00e9 \u010d\u00e1sti p\u016fvodn\u00ed hv\u011bzd\u00e1rny u Muzea Vojt\u011bcha \u0160afa\u0159\u00edka v prostoru ve\u0159ejnosti voln\u011b p\u0159\u00edstupn\u00e9m. P\u0159ij\u00edt se pod\u00edvat m\u016f\u017ee opravdu ka\u017ed\u00fd.<\/p>\n

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Pavel SUCHAN,\u00a0 Astronomick\u00fd \u00fastav AV \u010cR<\/strong><\/p>\n

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