Fall Equinox Day 2025 Events. In 2025, the equinox occurs on march 20, at 09:02 gmt. The march equinox marks the beginning of spring in the northern hemisphere and the first day of fall in the southern hemisphere.
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. Read about autumnal equinox around the world in 2025.