While there are many full moons in a year, there's something special about the rare occurrence of a blue moon. We think you'll agree after seeing these photographs. Read this article by Christopher MacManus on CNET.

20) full moon didn't look visibly different from other full moons during the year — the Blue Moon moniker simply denotes the third full moon in a season with four full moons — stargazers used the specially named moon as an excuse to look up at the

While there are many full moons in a year, there's something special about the rare occurrence of a blue moon. We think you'll agree after seeing these photographs. Read this article by Christopher MacManus on CNET.

Tonight is a Blue Moon, but unlike the picture above it won't actually be blue. So where does the name from? Let us explain.

Usually, when we talk about a Blue Moon, we're referring to the relatively rare occurrence of a second full moon in a single month. But just like months sometimes squeeze in an extra full moon, so do seasons. Instead of having just three full moons