Fall equinox in the northern hemisphere is in September and it marks a welcome shift in the seasons for many after a long, hot summer. But what exactly is an equinox? It's all about Earth and its relationship with the sun.

The autumn equinox is what officially marks the start of fall. When is the first day of fall in 2024? Here is what you need to know.

The autumn equinox, which comes around every September for the Northern Hemisphere, marks the official astronomical start of fall. This year, the equinox arrives Sunday, Sept. 22 at 8:44 a.m. Eastern, according to The Farmers' Almanac.

This year, the first day of fall is coming up on September 22, otherwise known as the autumnal equinox. From then on, you can expect to have to approach your trail adventures a li