Astronomy

September equinox

371days

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    There are 371 days until September equinox, on Thursday, 23 September 2027.

    September equinox at 06:01 UTC on 23 September 2027, 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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    Date source

    Computed astronomy

    Last verified Sep 10, 2026

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