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.” Related articles Last Blue Moon Until 2015 Visible Tonight (arkansasmatters.com) Continue reading Bye bye blue moon