My daughter is an astronomy nut so we get updates from
http://spaceweather.com this is what they posted today.
A SPOT OF FOLKLORE: September's full Moon is usually called the Harvest Moon, but not this year. By definition, the Harvest Moon is the full Moon closest to the autumnal equinox. This year's equinox falls on Sept. 23rd and the full Moon closest to that comes on October 7th. The 2006 Harvest Moon will have to wait until October.
KC