| astrology | A pseudoscience that holds that people and events are influenced by the configurations of the Sun, Moon, and planets with respect to each other and the stars.
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| deferent | One of the circles on which a planet moved according to the Ptolemaic model of the solar system.
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| epicycle | One of the circles upon which a planet moved according to the Ptolemaic (geocentric) model of the solar system. The center of the epicycle moved on a larger circle, called the deferent.
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| equant | In the Ptolemaic system, the point from which the motion of the epicycle around the deferent is uniform.
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| geocentric | Centered on the Earth. In a geocentric model of the solar system, the planets moved about the Earth.
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| precession | The slow, periodic conical motion of the rotation axis of the Earth or another rotating body.
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