Once in a Blue Moon

（People's Daily Online）  15:39, September 04, 2012

Edited and translated by Chen Lidan, People's Daily Online

The “blue moon” is an astronomical term that refers to the third full moon in a season that has four full moons instead of the usual three and in just this past August, sky-watchers enjoyed the second full moon within a single month that qualifies it as a blue moon. The next “blue moon” is supposed to show up in July 2015.