Vernal Equinox Definition

noun
One of two points at which the ecliptic intersects the celestial equator. At the vernal equinox, the sun is moving along the ecliptic in a northeasterly direction.
American Heritage
The moment at which the sun passes through this point on or about March 21, marking the beginning of spring in the Northern Hemisphere and autumn in the Southern Hemisphere.
American Heritage
Synonyms:
Antonyms:

Other Word Forms of Vernal Equinox

Noun

Singular:
vernal equinox
Plural:
vernal-equinoxes

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vernal equinox