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equinox US English

The time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20)

equinox New Oxford Dictionary for Writers & Editors

date at which day and night are of equal length

spring equinox US English

Another term for vernal equinox.

vernal equinox US English

The equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere

autumnal equinox US English

The equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere