September's equinox has arrived today, marking the beginning of astronomical autumn in the Northern Hemisphere, where the nights will get longer than the days until the s...
Thanks to its Latin name meaning "equal night," the equinox is often thought of as the day when dark and light each claim 12 hours, but that's not the case.
The harvest moon is the last full moon of the summer. This year it will appear to be full for three days with peak illumination occurring at 7:54 p.m. ET Monday.