When Is the First Day of Autumn?

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The Autumnal Equinox was on Tuesday, September 22, 2013.
The Autumnal Equinox is considered to be the first day of the Fall Season, when the length of night and day are approximately equal in length.
3 Additional Answers
The first day of autumn is the fall equinox. This is usually the day when the sun crosses the celestial equator moving southward. The dates of zero tilt of the Earth's equator usually correspond to the autumnal equinox and the vernal equinox.
Autumn, also known as Fall in some countries, is the season when the leaves fall from the trees. Autumn Equinox is experienced on the 22nd/23rd of September in the northern hemisphere, and 20th/21st of March in the southern hemisphere. At this time, the sun is directly overhead at the equator and the days and nights are about the same length. It is also known as September equinox and signifies the first day of autumn in the UK.
In the northern hemisphere, the first day of autumn season starts on the equinox. This is when the sun crosses the celestial equator moving southward. In 2010, the first day of autumn is 23rd September.
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