The Sturgeon Moon is what you will see in the night sky on Tuesday, Aug 20. At exactly 9:45 p.m. ET, the full moon is a true full Blue Moon and it's also a true full Sturgeon Moon for just a second, even though it will appear full the rest of the night, according to Yahoo News on Tuesday.
The term Blue Moon was originally coined for a third full moon within a four moon season, but in 1943, Sky & Telescope Magazine misprinted the definition of a full moon saying it was the second full moon within the same month. That meaning stayed and today, that is what most folks consider a real full moon.
Tonight's Blue Moon will fall under the original definition as well as the most widely accepted definition of a Blue Moon. The full moon on Tuesday night is also known as the Full Sturgeon Moon, the Green Corn Moon, the Grain Moon and the Full Red Moon.
People along the east coast of the U.S. will be able to get a good view of tonight's full Blue Moon or Sturgeon Moon. The Blue Moon is not a frequent occurrence as after tonight's Blue moon another Blue moon won't come around until 2015.