September 22 - 12:00 amEnd:
September 21 - 11:59 pm
The Autumnal Equinox
The word equinox comes from the Latin words for “equal night.” The fall and spring equinoxes are the only days of the year in which the Sun crosses the celestial equator.
From here on out, the temperatures begin to drop and the days start to get shorter than the nights.