What Day Is The Autumn Equinox In 2024 Calendar. 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 earth's axis. As with other astronomical events, the autumnal equinox.
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. The fall equinox is not on the same day each year, though it always falls between.