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precession of the equinoxes

Definition of precession of the equinoxes

  1. :  a slow westward motion of the equinoxes along the ecliptic caused by the gravitational action of sun and moon upon the protuberant matter about the earth's equator

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First Known Use of precession of the equinoxes

1621

Learn More about precession of the equinoxes

  1. Britannica.com: Encyclopedia article about precession of the equinoxes

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