When Is The Autumn Equinox 2025. 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. The data correspond to the seasons of the year 2025.


When Is The Autumn Equinox 2025

Sunday, dec 21 10:03 am est. The first day of autumn is in 2025 on september 22 (according to the astronomical definition).

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