September Equinox

One of two days during a year when the declination of the Sun is at the equator. The September equinox denotes the first day of fall in the Northern Hemisphere. In the Southern Hemisphere, this date marks the first day of spring. During the September equinox, all locations on the Earth (except the poles) experience equal (12 hour) day and night. The September equinox occurs on either September 22 or 23.

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