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We think of the equinoxes as always occurring on March 21 and September 21, but this can vary a day or two either way depending on the cycle of leap years.

This year, in 2010, the northern hemisphere end of summer occurs on September 23, 2010. at 03:09 Greenwich Mean Time. If you live in North America, summer ends for you late in the evening of September 22, depending on your time zone.

The U.S. Naval Observatory lists the dates and times for the solstices and equinoxes on their "Earth's Seasons" web page at the link below.

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14y ago

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