Once In A Blue Moon

History: Supposedly the moon is never blue, although, on a clear night, some people perceive a faint blue cast to part of the moon that is faintly visible when the bright part is in the shape of a fingernail. The rarity of the blue moon was suggested in a verse published in 1528 by William Roy and J. Barlow in Rede Me and Be Nott Wrothe: “Yf they saye the mone is belewe,/ We must beleve that it is true.”