September equinox
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There are 4,752 days until September equinox, on Friday, 23 September 2039.
September equinox at 03:49 UTC on 23 September 2039, computed with astronomy-engine. The Sun crosses the celestial equator heading south; day and night are close to equal length everywhere. Astronomical autumn begins in the Northern Hemisphere and spring in the Southern Hemisphere.
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- Worldwide
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Last verified Sep 10, 2026
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