The name equinox comes from the Latin aequus (equal) and nox (night).
We have an equinox twice a year – spring and fall – when the tilt of the Earth’s axis and Earth’s orbit around the sun combine in such a way that the axis is inclined neither away from nor toward the sun.
In the Northern Hemisphere, the fall equinox marks the first day of fall (autumn) in what we call astronomical seasons.
Equinoxes are opposite on either side of the equator, so the autumnal (fall) equinox in the Northern Hemisphere is the spring (vernal) equinox in the Southern Hemisphere and vice versa.
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