Astronomically, it begins with the autumnal equinox (around September 23 in the Northern hemisphere, and March 21 in the southern hemisphere), and ends with the winter solstice (around December 21 in the Northern hemisphere and June 21 in the Southern hemisphere). However, meteorologists count the entire months of March, April and May in the Southern hemisphere, and September, October and November in the Northern hemisphere as autumn. An exception to these definitions is found in the Irish Calendar which still follows the Celtic cycle, where Autumn is counted as the whole months of August, September and October.
Although the days begin to shorten after the summer solstice in the northern hemisphere or after the winter solstice in the southern hemisphere, it is usually in September or March where twilight becomes evidently shorter and more abrupt in comparison with the more lingering ones of summer.
More on [ Autumn ]

Autumn of Big Brother 2 - Video, biographical details, review, and message board.
Songwriters Directory: Autumn - Includes a profile and contact information.
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