There's a Blue Moon Tonight But Not Because of What You ThinkCasey Chan8/20/13 9:27pm1012EditPromoteGo to permalinkThe moon you see up in the night sky tonight is a Blue Moon. But no, it's not actually the color blue. Duh, everybody knows a Blue Moon isn't actually blue. A Blue Moon means the second full moon in the same month! But, um, that's not the reason why tonight's moon is considered a Blue Moon either. Wait, what?