Only when the moon, Earth and the sun are perfectly aligned is the moon 100% full. And sometimes — once in a blue moon — the moon is full twice in a month (or four times in a season ...

Another reason for the name, is because of the long winter nights when the cold lasts longest before the sun rises again.

Next week, Earth will be lined up between the Sun and the Moon, creating a total lunar eclipse. North Americans, at least, haven't seen such an eclipse, otherwise known as a "blood moon," in ...