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.

The Autumnal Equinox is a special day when the day and night are equal. This marks the beginning of shorter days and longer ...

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

Equinox will officially take place tomorrow (September 22) at 12.44pm GMT (1.44pm BST) - marking the start of the new season ...

Here's what to know about the autumnal equinox on Sept. 22, including what it means for your zodiac sign according 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 ... Administration is forecasting a ...

Here’s what to know about our new, temporary celestial neighbor. What’s a mini-moon, anyway? Earth has a large gravitational ...

See how our seasons come from Earth's tilt and yearly loop around the sun, which changes the ice cover, vegetation, and ...