Astronomy

September equinox

1799days

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    Event time shown in UTC. The countdown follows the same moment worldwide.

    Photo: Image by Przemyslaw "Blueshade" Idzkiewicz · CC BY-SA 2.0 · via Wikimedia Commons

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    There are 1,799 days until September equinox, on Tuesday, 23 September 2031.

    September equinox at 05:15 UTC on 23 September 2031, 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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    Date source

    Computed astronomy

    Source last checked Oct 10, 2026

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