Autumnal Equinox 2024 Usa Central Time Chart. These data are provided by the institut de mécanique. Spring starts on march 1, summer on june 1, autumn on september 1, and winter on december 1.

Autumn equinox 2024 (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. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.