Did you know that a blue moon is never really blue?

Did you know that a blue moon is the appearance of the third full moon in a season that has four full moons, instead of the usual three?

Did you know that a blue moon is never really blue?

Did you know that because a blue moon occurs only every two or three years, the term blue moon is used colloquially to mean a rare event, as in the phrase "once in a blue moon"?^[2]

Did you know that the Maine Farmers' Almanac says that blue moons will occur?

• August 21, 2013
• May 21, 2016
• May 18, 2019
• August 22, 2021

 Now if you didn't know, now you know...



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