First Day Of Fall 2024 Equinox. In 2024, the autumnal equinox will take. The first day of autumn often called fall (september equinox or autumnal equinox) is when the sun shines directly on the celestial equator passing from north to south and the.

22, in the united states and the rest of the northern hemisphere, because that’s the date. Fall’s start time on sunday, sept.