Autumnal Equinox – Fall Equinox
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Northern Hemisphere: (USA, Central America, Canada, Europe, Asia, northern Africa)September equinox 2014: September 23, at 02:29 UTC.
Southern Hemisphere: (Australia, New Zealand, South America, Southern Africa)March equinox 2015: March 20, at 22:45 UTC.
Equinoxes are opposite on either side of the equator, so the autumnal (fall) equinox in the northern hemisphere is the spring (vernal) equinox in the southern hemisphere and vice versa.
On the two equinoxes every year the sun shines directly on the equator and the length of day and night is nearly equal – but not exactly.
First day of fall?
In the USA and some other areas in the northern hemisphere, the autumnal equinox marks the first day of fall (autumn). However, the official date for the first day of fall varies depending on the country's climate.
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