Astronet > Forumy > Obsuzhdenie publikacii Astroneta > Obshaya kartina sumerechnyh yavlenii

G. V. Rozenberg · 19.10.2002 17:04

Pod sumerkami ponimayut ves' kompleks opticheskih yavlenii, sovershayushihsya v atmosfere, kogda Solnce nahoditsya vblizi gorizonta, to est' v period vremeni, razdelyayushii dnevnye usloviya osvesheniya ot nochi. Osnovnym faktorom, opredelyayushim hod etih yavlenii, sluzhit rasseyanie solnechnogo sveta v zemnoi atmosfere i svyazannoe s nim oslablenie pryamyh luchei Solnca.
>> Prochitat' stat'yu

V. S. Dubovik · 12.06.2019 0:17

Zamechatel'naya stat'ya! Odin iz samyh poznavatel'nyh materialov po astronomii, kotorye dovelos' chitat'. Esli sumerki mogut zatyanut'sya do 22-23 gradusov, stalo byt', slabaya zarya vsyu noch' bliz dnya letnego solncestoyaniya vozmozhna i yuzhnee 48 shiroty, vplot' do Sochi, gde, kak prinyato schitat', temnye nochi. Uslovno granicu svetlyh nochei mozhno provodit' po 45 shirote, no ostatochnye priznaki sumerek mogut po nekotorym dannym nablyudat'sya vplot' do pogruzheniya solnca na 30 gradusov, to est' polnocennye astronomicheskie nochi vozmozhny yuzhnee 36 shiroty.