The "autumnal equinox" is a single point in time, not a period. In 2015, the autumnal equinox will happen at 08:20 (UT) on the 23rd September.
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The autumnal equinox typically starts in September, specifically around September 22nd or 23rd in the Northern Hemisphere.
The autumnal equinox in 1978 occurred on September 23rd. It marks the official start of fall when day and night are nearly equal in length.
The vernal equinox in 2010 occurred on March 20th, and the autumnal equinox occurred on September 22nd.
fall equinox partial equinox
The next equinox is the autumnal equinox, which falls on September 22nd in the northern hemisphere and March 20th in the southern hemisphere.
Spring equinox occurs around March 20 and Fall equinox occurs around September 22 for the Northern Hemisphere. For the Southern Hemisphere these dates are opposite; the Spring equinox is around September 22 and the Fall equinox occurs around March 20.