Autumn Equinox 2025 Est Time Zone. 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. Coordinated universal time is 5 hours.

Sunday, dec 21 10:03 am est. In different time zones, the date of the equinox may differ by a day, so it is important to indicate your exact location.