Precession of the Earth
•The earth’s axis of rotation is tilted 23.50 relative to the plane containing the sun and other planets.
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•The gravity from the Sun and moon is trying to tip the earth just like gravity is trying to tip a spinning top.
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•As with the top, the axis of the earth wobbles or PRECESSES in space, with a 26,000 year period.
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•Because the directions to the celestial poles are defined by the spin axis – those poles move with time.
–It isn’t that the stars move – it is that the grid we paint on the celestial sphere has to be redrawn from time-to-time.
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–Eventually Polaris will not be the “pole” star.
(From our Text:  Horizons, by Seeds)