JACKSON, Miss. – While most people consider the month of September to be the beginning of fall, the official astronomically correct start of fall is tonight (Monday, Sept. 22) with the autumnal equinox. In Mississippi the autumnal equinox begins at 9:29 p.m.
During the equinox the sun will shine directly above the equator, meaning you will get a solid 12 hours of day and night. In the coming months, the will sun begin to rise later in the day, and nightfall will come sooner until the winter solstice on Dec. 21, 2014.
For now, there is no need to roll your clock back just yet. You will not have to do that until Nov. 2.