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Day and night get equal billing on Tuesday. A guide to the fall equinox

Phys.org — September 22, 2026 at 04:51 PM UTC

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Day and night get equal billing on Tuesday. A guide to the fall equinox

The fall equinox is Tuesday, when light and darkness split the day evenly. It marks the beginning of fall for the Northern Hemisphere and the beginning of spring in the Southern Hemisphere.