The full moon that occurs closest to the autumn equinox is known as the "harvest moon." This moon's name signifies the corn harvesting season, a time when farmers can stay out in the fields later than usual.
Typically the moon rises a little later each night, reports the Farmers' Almanac. But for several days before and after the full harvest moon, the moon rises on the same time, almost appearing as if there are several full moons in a row. That means a lot of bright light at night, which makes it easy for farmers to harvest their crops.