equinox
1.
(
noun
) 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
Related Words:
March equinox
,
September equinox
,
autumnal equinox
,
cosmic time
,
fall equinox
,
spring equinox
,
vernal equinox
2.
(
noun
) (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
Synonyms:
equinoctial point
Related Words:
autumnal equinox
,
celestial point
,
vernal equinox
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