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Therefore, astronomical dates for the start of seasons are (for the northern hemisphere): Around the 21st December for Winter, around the 21st of March for Spring, around the 21st of June for Summer and around the 21st September for Autumn (fall).
Seasons are fundamental to how we understand the climate and the environment, but for hundreds of years academics have argued that their specialist field is the one which defines official start of autumn. In meteorological terms autumn begins on September 1, as each season is defined as a three-month period. Astronomers base the date of the seasons upon celestial events, in this case the autumnal equinox, when night and day are roughly equal length.