Halloween Blue Moon Oct. 31

Many images associated with Halloween feature a cloud-draped full moon in the background.

Whether a witch is stirring her cauldron, bats are flying through the air or zombies are rising from a cemetery, a full moon is prominent in Halloween imagery. But just how common is a full moon on All Hallow’s Eve anyway?

According to “The Farmer’s Almanac,” a Halloween full moon occurs only once every 18 to 1…