Rhoads, Samuel E. Honolulu Community College, Honolulu, Hawaii.
- Celestial poles, celestial equator, and ecliptic
- Coordinate systems
- Motions of celestial objects
- Precession of the equinoxes
- Additional Readings
An imaginary sphere of infinite radius centered either on an observer or at the center of the Earth. We imagine that the stars and planets are attached to the inside surface of the celestial sphere. Standing outside on a clear moonless night far from city lights, it is easy to imagine that one is at the center of such a sphere and that the stars and planets are attached to its inside surface.
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