n. the time or date (twice each year) at which the sun crosses the celestial equator when day and night are of approximately equal length (about September 22 and March 20)
The autumnal equinox marks the beginning of autumn.
The autumnal equinox marks the beginning of autumn.
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The vernal equinox occurs on or about March 21.
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I wanted to know when is the spring equinox.
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equal day and night; vernal equinox; equinoctial
solstice
3 syllables
e-qui-nox
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