Autumn Equinox 2025 Est To Ist. Find out the dates, history and traditions of autumnal equinox. Autumn equinox 2025 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator, moving from the northern hemisphere to the southern.
Autumnal equinox on sunday, september 22, 2025. At the summer solstice, we have the longest day and the shortest night of the year.
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