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It is called the celestial sphere and it has coordinates like latitude and longitude. The simplest coordinates are elevation and azimuth, and there is another popular tilted coordinated system with its polar axis parallel to the Earth's axis. In this system the coordinates are the declination and the hour-angle.

A fixed star keeps the same declination all the time and its hour-angle advances by 360 degrees every 23hr 56 min as the Earth rotates on its axis.

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