Question

How to calculate angels beteween star and earth ? angle α ?

Answer 1

In astronomy and celestial navigation, the hour angle is one of the coordinates used in the equatorial coordinate system to give the direction of a point on the celestial sphere. The hour angle of a point is the angle between two planes: one containing the Earth's axisand the zenith (the meridian plane), and the other containing the Earth's axis and the given point (the hour circle passing through the point).

Answer 2

in astronomy and celestial navigation........