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The 22nd of September is the start of the astronomical autumn season coinciding with the Autumnal Equinox in 2010. This date is sanctioned by the International Astronomical Union and can vary by a day or two from one year to the next.

See the link below for more information on the Equinox (changing of the astronomical seasons).

The climatological autumn season begins on the 1st of September. This date is sanctioned by the World Meteorological organization and never changes from one year to the next.

The ecological autumn seasons begins locally whenever the leaves of deciduous trees turn colour and begin to fall. The date of this occurrence varies from one region to another and can shift from one year to the next.

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14y ago

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