Farmers named the harvest moon —a full moon near the time of fall equinox — in the days before electric lights. Farmers used the harvest moon to spend more time gathering crops.
Typically the harvest moon comes within days or weeks of the equinox. But this year the moon hits its maximum brightness six hours after the equinox, which is at 8:10 p.m., said Griffith Observatory Curator Laura Danly.
The full moon is at its brightest at 2:17 a.m.