Autumn Equinox 2025 Est. This page provides date and time for autumnal equinox in the year 2025 for new. 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 first day of autumn often called fall (september equinox or autumnal equinox) is when the sun. The following table gives the date and time of the important astronomical events for the year.