
The moon will be full on Tuesday, Sept. 17: The Harvest Full Moon.
The Harvest Moon isn't exclusively a September event because the full moon occurring closest to the autumnal equinox gets hung with this moniker. Every few years, October (rather than September) hosts this moon that once was critical to farmers. Before electricity and tractors with lights were used to harvest crops all night long, farmers relied on the Harvest Moon's light to extend workdays when fields were most bountiful.