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There is no official date for autumn that carries any legal sanction like the days, months, and years that are the official/legal units of time. The World Meteorological Organization designates September 1 local time as the first day of the climatological autumn season. The International Astronomical Union designates the Autumnal Equinox as the beginning of the astronomical autumn season. In 2010, this falls on September 22 across most of North America and September 23 across Europe and Atlantic Canada. The astronomical seasons have been picked up and heavily promoted by the mass media, educators, and calendar makers. In fact though, the conventional astronomical reckoning has no more official status than any other method of determining seasonal change. The ecological autumn season begins locally whenever the leaves of deciduous trees change colour and begin to fall to the ground. The timing of this varies from one region to another and can even shift from one year to the next.

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14y ago

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