There will be three full moons during the summer. And the sky this season has a number of bright stars that form easily ...

Sept. 22, day and night will be nearly equal in length as Earth spins side-on to the sun and autumn officially begins in the ...

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 ...

Fall equinox in the Northern Hemisphere is in September ... You can go around and declare, "It's officially the first day of autumn!" How you celebrate is up to you. Here's a suggestion: Put ...

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 ...

As the Northern Hemisphere welcomes spring today, the Southern Hemisphere greets the first day of autumn. The word equinox is derived from the Latin words "aequus" (equal) and "nox" (night).