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 ...

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

The autumnal equinox in the Northern Hemisphere falls on Sunday, Sept. 22 this year. If you want to be extra specific and put it on your calendar, then mark it for 5:44 a.m. PT.

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 ...

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 ...

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 ...

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 ...