On Friday, Aug. 31, skywatchers will be treated to a Blue Moon. Does this mean the Moon will actually look blue? Unfortunately, no. To understand the celestial event — and the story behind the name — we've prepared a briefA blue moon isn't actually all that rare; more frequent, for example, than Preston's wonderful Guild Week which was the subject of a Northerner post yesterday. It appears in the sky every two or three years, as a result of the mismatch between theYour last chance to see a blue moon until 2015 will come around this Friday, but don't expect an azure hue in the sky. In fact, " blue moon " refers not to color, but to rarity. Blue moons are defined as either the fourth full moon in a season, orFriday Aug. 31 will mark the second full moon in the month, a phenomenon which only happens seven times every 19 years.August 31 is the second full moon in a calendar month, which earns it the epithet Blue Moon, the last time this will be seen until 2015.
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