Tonight is the blue moon -- which isn't blue, of course, unless you happen to be near a volcano. It was actually a mistake by an amateur astronomer in Sky & Telescope magazine in 1946 that led to our ...

Just exactly when is the next Supermoon Blue Moon? As we ready ourselves for the Supermoon Blue Moon on Monday, Aug. 19 where it officially becomes 100% full at 2:26 p.m. EDT (1826 GMT). Some of you ...

Blue moons occur every 2.7 years on average. Friday is your last chance to see one until July 31, 2015. This Friday's full moon is known as a "blue moon," the second full moon in the calendar month.

Blue moon is either the second full moon in a calendar month or the third in an astronomical season with four full moons. The ...

Tomorrow night's the Blue Moon. It won't actually be blue unless you happen to be near a volcano. Volcanic ash and forest fires can turn the moon blue. The secret? It's the ash. If all the ash ...

Tonight (Aug. 19) skywatchers will be able to gaze upon a most "unconventional" full moon, because it will also be — a "Blue Moon." Yet it indeed is a "Blue" moon, but only if we follow a now somewhat ...

Value-conscious sky watchers can rejoice Monday as the night could bring into focus a rare two-for-one: a supermoon and a seasonal blue moon converged for a single viewing. NASA says that combination ...

Tonight is the blue moon. Of course, it won't actually be blue unless you happen to be near a volcano. Volcanic ash and forest fires can turn the moon blue. The secret? It's the ash. If all the ash ...