The old saying goes "Once in a Blue Moon." however Blue Moons aren't all that rare . A blue moon occurs approximately every 33 months, or about 41 times in a century. Blue moons aren't blue, as with a Supermoon, this night's Blue Moon, is also a supermoon, there is no real change to on the moon itself.
A blue moon can be either the the second full moon in a given month also which is called a calendrical Blue Moon. The 4th Full moon in a season, like this Blue moon, is a Seasonal Full moon .
The first full moon of September is often is often called the corn moon....and yes there is blue corn, it is not dyed that color as some might believe. The Hopi were growing bluecorn when the Spanish arrived.
It creates a poetic image of a late August night, filled with stars and graced with with the second full moon of the month. A full moon that would otherwise have been known as the Corn Moon. I am more than sure that the first full moon name I learned was the Corn Moon, and was mightily confused by it. "How did the moon know when it was time to pick corn?" A logical question for a 6 year old,way back in the early 50's. Add to that it was the first time I had ever seen the multi colored ears of the variety called Indian Corn.
The Magical History of corn
llher's Choice/Getty Imagse


