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Wikipedia: An equinox is an astronomical event in which the plane of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 23 September...
...The
equinoxes are the only times when the solar terminator (the
"edge" between night and day) is perpendicular to the
equator. As a result, the northern and southern hemispheres are
equally illuminated.
In
other words, the equinoxes are the only times when the subsolar
point is on the equator, meaning that the Sun is exactly
overhead at a point on the equatorial line. The subsolar point
crosses the equator moving northward at the March equinox and
southward at the September equinox.
The
equinoxes, along with solstices, are directly related to
the seasons of the year. In the northern hemisphere, the vernal
equinox (March) conventionally marks the beginning of spring in
most cultures and is considered the New Year in the Persian calendar
or Iranian calendars as Nouroz (means new day),
while the autumnal equinox (September) marks the beginning
of autumn. In the southern hemisphere, the vernal equinox occurs in
September and the autumnal equinox in March...
...A number of traditional spring and autumn (harvest) festivals are celebrated on the date of the equinoxes.
...A number of traditional spring and autumn (harvest) festivals are celebrated on the date of the equinoxes.