2024 Equinox. This sunday, the autumnal equinox is upon us, and with it, a shift to shorter days, longer nights and the astronomical start of fall in the northern hemisphere. December 21, 2024 at 1:20 am pst.

Noaa’s goes east satellite captured the moment of autumnal equinox from space on sept 23, 2019.(image credit: The 2024 fall equinox—also called the autumn equinox—takes place on sunday, september 22, 2024.