Precession-of-the-equinoxes Definition

noun
The occurrence of the equinoxes earlier in each successive sidereal year because of a slow wobble in the earth's axial spin which shifts the equinoctial points slightly westward along the ecliptic: the wobble is caused by the pull of the sun and moon on the earth's equatorial bulges and makes the poles move around a center point (axis of the ecliptic), taking about 25,800 years to return to the same orientation with the stars.
Webster's New World

Other Word Forms of Precession-of-the-equinoxes

Noun

Singular:
precession-of-the-equinoxes
Plural:
precessions of the equinoxes
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