Sankt-Peterburgskaya astronomicheskaya olimpiada
18.12.2012 11:16 | Astronet

Uvazhaemye druz'ya! Nastupil novyi Olimpiadnyi God! My priglashaem Vas i vashih tovarishei prinyat' uchastie v Sankt-Peterburgskoi astronomicheskoi olimpiade. S 6 dekabrya 2012 g. po 15 yanvarya 2013 g. prohodit otborochnyi etap Olimpiady (v forme zaochnogo tura). Zadaniya tura razmesheny na saite Olimpiady. Pravila uchastiya ostayutsya prezhnimi. S nimi mozhno oznakomit'sya na tom zhe saite.

Solnechnaya kolonna nad Shveciei
18.12.2012 | Astronomicheskaya kartinka dnya

Vy kogda-nibud' videli solnechnuyu kolonnu? Kogda vozduh dostatochno holodnyi, a Solnce voshodit ili zahodit, padayushie kristalliki l'da mogut otrazit' solnechnyi svet osobym obrazom, sozdavaya neobychnyi stolb sveta. Inogda led, padayushii vniz s bolee vysokih oblachnyh sloev, skladyvaetsya v ploskie shestiugol'nye kristally.