See the blue moon tonight, then say goodbye until 2015

(Photo: Picasa  /  Sid Vedula)

A blue moon will grace the night sky Friday night, giving skywatchers their last chance to observe this celestial phenomenon for nearly three years.

The moon will wax to its full phase at 9:58 a.m. EDT Friday, bringing August’s full moon count to two (the first one occurred Aug. 1). Two full moons won’t rise in a single month again until July 2015.