It’s almost time to bid farewell to summer and say hello to fall. The autumn equinox of 2025 occurs at 2:19 p.m. Eastern time on Monday, Sept. 22, marking the official start of the season known for ...

You might hear the term "autumn equinox" tossed around Sept. 22 on the first day of fall. But what exactly does that mean? Is it different from a solstice? Yes, actually. They mark seasonal changes ...

The fall season officially begins on Monday, Sept. 22, 2025, with the autumnal equinox. An equinox occurs when the Earth's axis is tilted neither toward nor away from the sun, resulting in nearly ...