Once in a blue moon!

If you have read The Stone Summons, you may remember my Gran and me saw a blue moon.  A skid at  school started making a fool of me, saying blue moon was just a phrase and din't mean the moon was blue.  So I was very happy when our science teacher showed me this!  (How did he know it mattered?  Because this skid put it on Facebook, didn't he! But doesn't know anything about privacy settings, serves him right!)

"The origin of the modern version of this phrase dates to March 1946, when amateur astronomer James Hugh Pruett made a calendar error in an article for Sky & Telescope magazine.  Before then, the definition of a blue moon wasn’t quite set in stone.  It meant different things, including an obvious absurdity, a symbol for sadness and loneliness, a gin and curaçao cocktail, or a rare event.  In some very unusual cases the moon will actually appear blue, generally because of dust resulting from a volcanic eruption, forest fire, or dust storm.  The twice-in-one-month full moon definition has now become the standard."

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