Autumn Equinox 2024 Time. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall. What happens during the autumn equinox?
The autumn equinox marks the start of the season, meaning it’ll take place on september 22 this year. 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,.