Fall Equinox 2024: Official Start of Autumn This Sunday

The autumnal equinox will occur on September 22, bringing nearly equal day and night lengths to the Northern Hemisphere.

The fall equinox will take place at 8:43 a.m. ET on Sunday, September 22, 2024.
This astronomical event marks the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
During the equinox, the Earth's axis is tilted neither toward nor away from the sun, resulting in nearly equal daylight and darkness.
The equinox has significant cultural importance, with celebrations at places like Stonehenge and the marking of the harvest season.
Following the equinox, days will continue to shorten until the winter solstice on December 21, 2024.