Former NASA astronaut and Columbia University professor Mike Massimino joins TODAY to share his unique perspective to explain ...

According to Britannica, the fall equinox is one of two moments in the year when the sun is exactly above the equator. The ...

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

The official first day of fall, otherwise known as the autumnal equinox, is this weekend in the Northern Hemisphere.

On Sept. 22, the fall equinox formally heralds in autumn and marks the end of summer in the Northern Hemisphere.

If you get up early enough, you can experience an equinox sunrise. The autumnal equinox heralds the arrival of fall in the northern hemisphere.

As the sun sets, it lines up perfectly with Chicago's east-west streets and is framed by downtown skyscrapers. The possible ...

While the northern states are known for peak foliage during fall, there are places in Florida where the red maples live up to ...

MYRTLE BEACH, SC (WMBF) - Today is the first day of Autumn but why is the first day of Fall different each year?

New England marks the fall season with cool temperatures, coastal flood potential, and a mix of sun and clouds.

The unseasonable heat is finally on its way out as we will welcome Fall with temperatures in the 60′s on Sunday.

The autumnal equinox officially marks the start of fall. The word "equinox" comes from the Latin words "aequus" and "nox," which mean "equal or even" and "night," respectively. That's because ...