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