Star A is visible one hour after dark at the latitude of Moscow on February 1, while star B has the same visibility conditions

Star A is visible one hour after dark at the latitude of Moscow on February 1, while star B has the same visibility conditions on August 1. Which of these stars will be visible longer at the latitude of Moscow in the evenings after these dates?

The moment of setting of any star at any fixed latitude corresponds to a certain sidereal time, which does not depend on the season of the year. Each subsequent day, the Sun culminates about 4 minutes later sidereal time, but the sidereal time of sunset and the end of evening twilight is shifted by a different amount. In early February, the length of daylight hours at the latitude of Moscow increases, and the sidereal time of sunset increases by more than 4 minutes each subsequent day. Therefore, the duration of the evening visibility of star A in February will rapidly decrease, and soon this star will disappear in the rays of the setting Sun.
In August, when the daylight hours decrease, the sidereal time of sunset increases much more slowly. Due to the earlier onset of darkness, star B will be visible in the evenings long after August 1.

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