Fall Equinox 2024 Southern Hemisphere. The autumn equinox arrives at 10:21 a.m. 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.

In the southern hemisphere the equinox occurs on march 20 or. The september 22, 2024, equinox marks a significant astronomical event, heralding the beginning of fall in the northern hemisphere and the start of spring in the.