The coordinates of the stars are a = 3h, d = 0; a = 7h, d = 0. Find the angular distance between the stars in the sky

The angular distance between stars is defined as the length of the arc of the great circle of the celestial sphere from one star to another. In our case, the great circle is the celestial equator, all points of which have declination b = 0. Therefore, the angular distance is the difference in right ascension, which is 4 hours or 60.

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