Bye bye blue moon

The last blue moon until 2015 sets in a crystal clear San Diego sky.  

A blue moon isn’t really blue.  It’s the second full moon in a month.  This August there were two full moons so the one that rose on August 31st and set on September 1st is a “blue moon.”  The next blue moon is in 2015.  The term “blue moon” is an expression denoting a rare event such as, “once in a blue moon.”

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