precession of the equinoxes

noun phrase

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

First Known Use of precession of the equinoxes

1621, in the meaning defined above

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preces

precess

precession

precession of the equinoxes

pre-Chellean

prechelonian

prechill

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The first known use of precession of the equinoxes was in 1621

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