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Autumn Equinox (Automnal)
The next Autumn Equinox (Automnal) is in 55 days, on September 23, 2022
About Autumn Equinox (Automnal)
The September equinox (or Southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward.
Due to differences between the calendar year and the tropical year, the September equinox can occur at any time between September 21 and 24. At the equinox, the Sun as viewed from the equator rises due east and sets due west.
Before the Southward equinox, the Sun rises and sets more northerly, and afterwards, it rises and sets more southerly. The equinox may be taken to mark the end of astronomical summer and the beginning of astronomical autumn (autumnal equinox) in the Northern Hemisphere, while marking the end of astronomical winter and the start of astronomical spring (vernal equinox) in the Southern Hemisphere. The Autumnal and Spring equinoxes mark the point in the calendar at which the length of night and the length of day are almost exactly equal.