noun
The equinox is the time or date at which the sun crosses the celestial equator, when day and night are of equal length.
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The equinox occurs twice a year when day and night are of equal length.
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Hey, did you know the equinox is coming up soon?
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I love when the equinox hits because it means spring is finally here.
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The equinox represents a balance between light and darkness in nature.