Autumnal equinox Sep 23, 2023

Autumn has officially begun! In the Northern Hemisphere, the autumnal equinox falls on September 23 this year, marking the beginning of autumn. Today is one of the two moments in the year when day and night are equal in length, thanks to the sun"s location exactly above the equator. In the Southern Hemisphere, today marks the vernal equinox and they are heading into spring.

© Stephen Matera/Tandem Stills + Motion

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Today in History

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