Fall aboard! The autumnal equinox marks the start, happening at 8:43 a.m. ET on Sunday, Sept. 22. Here's everything you need to know about the season.

During an equinox, places around the globe experience nearly equal amounts of daytime and nighttime. The second occurrence ...

The autumnal equinox heralds the arrival of fall in the northern hemisphere, and it's just around the corner. Here's what to ...

Twice a year, the sun doesn’t play favorites. Everyone on Earth is seemingly on equal status – at least when it comes to the ...

So is the autumnal equinox, which marks the end of astronomical summer and the first day of fall in the Northern Hemisphere. The exact time of the fall equinox changes slightly each year. This year, ...