What is Geographical Position or GP ?

The geographical position of a heavenly object is the spot on the Earth’s surface where an observer would see the object directly over head, the zenith point. You can think of it as where a line connecting the center of the Earth and the center of the heavenly object intersects the Earth’s surface.

Since the Earth is spinning on it’s axis, the GP is always changing, even for Polaris since it is not exactly on the axis.

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