And remember it’s a “seasonal” Blue Moon … the third of four full moons in a season, coming up on the night of August 20-21.
So maybe you’re saying, “But I thought a Blue Moon was the second full moon of a month.”
Yes, it is. The name Blue Moon is part of folklore. Like all folklore, there are alternate versions of the story.
A Blue Moon can be the second of two full moons of a calendar month. Or a Blue Moon can be the third of four full moons in a season. The upcoming Blue Moon is the seasonal kind. A “season” in this case is between the June solstice and September equinox.Here’s more.
Thank you to EarthSky Facebook friend VegaStar Carpentier for this image!
Eleanor Imster has helped write and edit EarthSky since 1995. She was an integral part of the award-winning EarthSky radio series almost since it began until it ended in 2013. Today, as an EarthSky.org Editor, she helps present the science and nature stories and photos you enjoy. She and her husband live in Tennessee, where they enjoy guitar playing and singing. They have 2 grown sons.