KANSAS CITY, Mo. (WDAF) — A full moon with a special name given only once every three years will rise this week, according to the Farmer’s Almanac.

The Corn Moon is a full moon that rises in September. The September full moon is usually called the Harvest Moon because it is normally the closest full moon to the autumn equinox.

Every third year, however, a full moon comes in October that’s even closer, making the September full moon a Corn Moon.