A Full Corn Moon or Full Harvest Moon are names given by Native Americans to the full moons that usually happen in September. These moons enabled them to identify when corn was supposed to be harvested. Most often, the Full Corn Moon happened close to the fall equinox.
https://www.facebook.com/spiritsoperator/posts/343722816990133
Native American tribes gave several names to full moons to help track the seasons. Each full moon name corresponded to the month during which it was seen. For example, there is the Full Corn Moon when it is time to gather corn, pumpkins, or rice.
There is the Full Hunter’s Moon when tribes begin storing meat before winter. There is the Full Beaver Moon when Native Americans were trapping beavers to make warm clothing from their furs. And then, there is the Full Cold Moon when winter nights are long and extremely cold.
https://www.facebook.com/LUNOBOBIBUBU/posts/1306911009640059
This year, the Full Corn Moon will rise in the eastern sky on September 2nd, 2020. The Harvest Moon, the full moon closest to the autumnal equinox, will be seen only on October 1st, 2020.
“When September’s full moon occurs early in the month, the full moon of early October lands nearest to the autumnal equinox and therefore takes on the Harvest Moon title instead,” the Almanac explained to USAToday.