Spherical astronomy is a science studying astronomical coordinate frames, directions and apparent motions ofcelestial objects,determination ofposition from astronomical observations, observational errors, etc. We shall concentrate mainly on astronomical coordinates, apparent motions of stars and time reckoning. Also, some of the most important star catalogues will be introduced.
For simplicity we will assume that the observer is always on the northern hemisphere. Although all definitions and equations are easily generalized for both hemispheres, this might be unnecessarily confusing. In spherical astronomy all angles are usually expressed in degrees; we will also use degrees unless otherwise mentioned.
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