Autumn Equinox 2025 Est Time. Autumnal equinox on sunday, september 22, 2025. There are two equinoxes each year marking the dates on which the spring and autumn seasons begin and the apparent geocentric sun crosses the celestial equator.

This year, autumnal equinox is occurring on the below date and timing: The spring and autumn equinox is an astronomical phenomenon, in which the day is equal to the night, they mark the change of the seasons.