Blue Moonz

Blue Moonz is a moontage of topics about Blue Moons, with links to Blue Moon and moon related items.

What is a Blue Moon?

When you hear someone say "Once in a Blue Moon…" you know what they mean: Rare. Seldom. Maybe even absurd. After all, when was the last time you saw the moon turn blue?

Blue Moon

There are in fact two definitions for a blue moon. According to the more recent definition, a blue moon is the second full moon in a calendar month. For a blue moon to occur, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month (the average span between two moons is 29.5 days).
 
Once in a Blue Moon

"Blue moon" appears to have been a colloquial expression long before it developed its calendrical senses. According to the Oxford English Dictionary, the first reference to a blue moon comes from a proverb recorded in 1528:

If they say the moon is blue,
We must believe that it is true.
Saying the moon was blue was equivalent to saying the moon was made of green (or cream) cheese; it indicated an obvious absurdity. In the 19th century, the phrase until a blue moon developed, meaning "never." The phrase, once in a blue moon today has come to mean "every now and then" or "rarely"—whether it gained that meaning through association with the lunar event remains uncertain.
 

 

Blue Moons 2007–2010

  • May 31 2007 Second full moon in month
  • May 20 2008 Third full moon in a season of four full moons (not a blue moon in the commonly used sense of the second full moon in a month)
  • Dec. 2009 Second full moon in month
  • Nov. 2010 Third full moon in a season of four full moons
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