The Sky Today on Monday, September 22: Astronomical autumn begins
The autumnal equinox today brings the changing of the seasons as summer ends for those in the Northern Hemisphere.
The autumnal equinox occurs at 2:19 P.M. EDT. On this date, the Sun appears directly above the equator and the Northern and Southern hemispheres receive the same amount of sunlight. The autumnal equinox also officially brings the Northern Hemisphere ...