per EarthSky: "Simply stated, the Harvest Moon is the full moon that falls the closest to autumnal equinox, which in 2013 comes on September 22. So the full moon that comes tonight and early tomorrow – September 18-19, 2013 – is the Harvest Moon. The moon reaches the crest of its full phase at 11:13 Universal Time on September 19 (6:13 a.m. CDT, in other words before sunrise tomorrow for most of us in the U.S.)"
Harvest Moon Begins
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