'Blue Moon - Happy New Year!': Happy New Year everyone! A blue moon, taken early-ish (8am today) on New Year's Day 2010. A blue moon is so-called because it was the second full moon of the month, and this one has coincided with New Year's Eve. Blue moons occur every two or three years but the next time one takes place on New Year's Eve will be in 2028 - can't wait . . !!