Fall Equinox 2024 Usa Time. The autumn equinox, or the september equinox, represents the time in the year when the position of the sun is directly above the equator. Autumnal equinox, two moments in the year when the sun is exactly above the equator and day and night are of equal length;

Cdt) on september 22, 2024. Autumn 2024 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the.