You know what it looks like… but what is it called?
TAKE THE QUIZ“the equinoxes”
We have one entry that includes the term the equinoxes.
precession of the equinoxes
noun phrase: 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