What is a Blue Moon?

There are in fact two definitions for a blue moon. According to the more recent definition, a blue moon is the second full moon in a calendar month. For a blue moon to occur, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month (the average span between two moons is 29.5 days). There will be no Blue Moons in 2008.

"Blue Moons." Infoplease.
© 2000–2006 Pearson Education, publishing as Infoplease.
13 Oct. 2006 www.infoplease.com/spot/bluemoon1.html.

More information about the moon:     Lunar Weather                Lunar News

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