An equinox in astronomy is that moment in time (not a whole day) when the
centre of the Sun can be observed to be directly above the Earth's equator,
occurring around March 20 and September 23 each year. These are the
Autumnal Equinox and the Vernal Equinox. Which is which depends on which
hemisphere you live in.
Equinox derives from latin meaning "equal night" because at the time of the Equinox day and night are of equal in length.
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