Define the term equinox (geograph)
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An equinox is an event in which a planet's subsolar point passes through its Equator. The equinoxes are the only time when both the Northern and Southern Hemisphere experience roughly equal amounts of daytime and nighttime

Explanation:

Halfway between the solstices, neither hemisphere is tilted towad the sun. each of these days is called an equinox, which means equal night. this day occours when the sun passes directly overhead at the equator at noon, and night and day are both 12 hours long.

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