Sunday is the first day of fall in the Northern Hemisphere. The northern half of the planet entered the autumnal equinox along with the official change in season at 8:43 a.m. Eastern Time., The National Weather Service said.

The official first day of fall, otherwise known as the autumnal equinox, is this weekend in the Northern Hemisphere. According to Encyclopedia Britannica, it is one of only two days, the other being the vernal equinox, when the sun is directly above the Equator, essentially dividing night and day into equal portions.