It Only Happens Once In a Blue Moon

By Will Smith

Tonight is a semi-rare occurrence, a blue moon. The full moon in the sky won't actually be blue though.

Tonight is the peculiar semi-astronomical phenomenon known as a blue moon. A blue moon is not a moon of an unusual color, but the second full moon of a calendar month. A complete lunar cycle takes about 29.5 days to complete, so blue moons typically occur every two or three years.

I guess what I'm saying is, if it's cloudy tonight, I wouldn't be too worried about it.