September equinox
Sign in to saveAlso known as autumnal equinox in northern hemisphere, vernal equinox in southern hemisphere, southward equinox
the equinox on the earth when the Sun appears to leave the nothern hemisphere and cross the celestial equator
~6 min read
Encyclopedic overview
The September equinox (or southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences between the calendar year and the tropical year, the September equinox may occur from September 21 to 24.
Illumination of Earth by the Sun on the day of an equinox
Excerpted from Wikipedia’s “September equinox” article, available under the CC BY-SA 4.0 licence.
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