Autumnal Equinox or the 1st Day of Fall Sept 23

The autumnal equinox or the first day of fall arrives tomorrow, September 23rd at 9:09 MDT. On this day the sun is directly of the equator as the earth tilts away from the sun toward winter in the northern hemisphere. Day and nights are equal and the sun rises exactly in the west and sets exactly in the east. This day is the first day of spring in the southern hemisphere.

Another bid of trivia is that the ancients used this day to set-up their calendar at Stonehenge and at the Mayan pyramid.