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Precession Circle
An imaginary circle traced out against the sky by the Earth's Celestial Poles (perpendicular to the Earth's Equator) around the Ecliptic Poles (perpendicular to the plane of the Solar System). Each Celestial Pole moves very slowly around its circle, travelling about one degree every seventy years against the background of stars, under the influence of precession. The Northern Pole presently lies close to the star Polaris, making it the current Pole Star.
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