Halloween blue moon: Full moon will shine on Oct. 31 for 1st time since 1944.
That’s the case for this month. There was a full Moon on Oct. 1, known as the Harvest Moon, which usually appears in September. It is so named because it occurs closest to the autumnal equinox. The Sept. 2 full moon occurred too early to be known as the harvest moon and was instead a Corn Moon.