Why is a blue moon called blue when it isnt even blue?
It is called a blue moon when the full moon occurs twice in one month,,,,which is about once every 2.7 years. The earliest recorded English usage of the term “blue moon” was in a 1528 pamphlet violently attacking the English clergy,[3] entitled “Rede Me and Be Not Wrothe” (Read me and be not angry): “Yf they say the mone is belewe / We must believe that it is true” [If they say the moon is blue, we must believe that it is true]. Some interpret this “blue moon” as relating to absurdities and impossibilities,[4] and a similar moon-related adage was first recorded in the following year: “They would make men beleue … that þe Moone is made of grene chese” [They would make men believe … that the moon is made of green cheese]. An alternative interpretation uses the other Old English meaning of belewe (which can mean “blue” or “betrayer”).[5] The church was responsible for the calendar and used the complex computus to calculate the important date of Easter, which is based on the full moon.
