Find out the visibility conditions in Moscow for the star a Hydra with right ascension 09h28m and declination -08 ° 40 ‘for today. During what period of time (approximately) it can be observed in Moscow?
On the day of the 2nd round of the Olympiad (February 17), the star a Hydra, as seen from its right ascension, is close to opposition with the Sun, and its upper climax occurs around midnight. However, this star is located significantly south of the ecliptic, therefore, in northern latitudes it will rise much later than sunset and hide behind the horizon until dawn. Thus, in Moscow this star will be visible at night during the entire time period from sunrise to sunset, which, as seen from the declination of the star, is about 10 hours for the latitude of Moscow.
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