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precession
A slow but relatively uniform motion of the earth's rotational axis that causes changes in the coordinate systems used for mapping the sky. The earth's axis of rotation does not always point in the same direction, due to gravitational tugs by the sun and moon (known as lunisolar precession) and by the major planets (known as planetary precession).
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- Part of Speech: noun
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- Industry/Domain: Astronomy
- Category: General astronomy
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