precession of the equinoxes
noun phraseDefinition 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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Merriam-Webster unabridged
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Time Traveler for precession of the equinoxes
The first known use of precession of the equinoxes was in 1621
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