Look to the sky Friday to see a "blue moon."
But don't expect to see the color blue. A blue moon refers to the rarity of multiple full moons in a month or season. will be the second in August. The first took place on Aug. 1.
Two blue moons in a month typically occurs every 2.7 years, according to the Huffington Post.
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The last blue moon was on Dec. 31, 2009, and the next won't occur until 2015.
The "two moons in one month" definition of a blue moon is actually fairly modern, since the widespread adoption of the standard calender. In folklore, a blue moon was the third full moon of a season that had four.
Find out what's happening in Northridge-Chatsworthwith free, real-time updates from Patch.
For details on where to watch the blue moon online, click here.
For more lunar and solar-related articles on Patch, click on the links below.
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