Autumn Equinox 2025 Est Date. Autumn / fall equinox 2025 the autumn or fall equinox signals the end of summer on the astronomical calendar. The dates of autumnal equinox / fall for the next 10 years:
On the day of the winter (december) solstice, the sun passes through the southernmost point. 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.