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autumnal equinox

PRIMARY MEANINGS OF: autumnal equinox

1
 n
(astronomy) the equinoctial point that lies in the constellation of Virgo
2
 n
September 22
FULL DEFINITIONS OF: autumnal equinox
1

n (astronomy) the equinoctial point that lies in the constellation of Virgo

Type of:
equinoctial point, equinox
(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
2

n September 22

Synonyms:
September equinox, fall equinox
Antonyms:
March equinox, spring equinox, vernal equinox
March 21
Type of:
equinox
either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
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