Celestial sphere is an imaginary sphere surrounding the Earth with a gigantic radius.
In the celestial sphere model, earth is stationary and the stars are carried on a sphere that rotates about an axis that points at the North Star. In Figure 1 below, two stars, A and B, are each shown at four different positions (1, 2. 3. and 4) through which each star will pass during the course of one revolution of the celestional sphere. In addition, your location on the Earth in the Northern Hemisphere and the portion of the celestial sphere that is above your horizon are shown.
Is the horizon shown a real physical horizon or an imaginary plane that extends from your observing location on Earth out to the stars?
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