It's September. By some definitions, that means fall has begun. For others, it is still weeks away. Here's a guide on all things autumnal.

When is the first day of fall? What time is the autumn equinox? When do we change the clocks? Your questions answered.

Equinoxes occur twice a year, with night and day being almost the exact same length all across the world. The next equinox is the September fall equinox, beginning on Sept. 22, 2025 in North America.

Later this month, you could experience an equinox sunrise if you're up early enough. The autumnal equinox heralds the arrival ...

The meteorological seasons are defined as spring (March, April, May), summer (June, July, August), autumn (September, October ...