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

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Cite this Entry

“Precession of the equinoxes.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/precession%20of%20the%20equinoxes. Accessed 23 Jun. 2021.

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More from Merriam-Webster on precession of the equinoxes

Britannica.com: Encyclopedia article about precession of the equinoxes

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