Basic Idea of the Celestial Sphere

    Caption: The basic idea of the celestial sphere.

    A basic point for the discussion of the celestial sphere:

    1. A great circle is a circle that divides sphere into equal halves. (i.e., in twain).

    2. A small circle a circle that divides a sphere unequally.

    Credit/Permission: © David Jeffery, 2003 / Own work.
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