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September equinox

 Home Physics Subfields of physics Astrophysics Celestial mechanics Dynamics of the Solar System
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The September equinox, also known as the autumnal equinox in the Northern Hemisphere and the spring equinox in the Southern Hemisphere, occurs around September 22 or 23 each year. During this event, the Sun crosses the celestial equator, and day and night are approximately equal in length all over the world.

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