How Often is ‘Once in a Blue Moon,’ Anyway?

Name: How Often is ‘Once in a Blue Moon,’ Anyway?
Uploaded: 2014-07-29T19:38:50+00:00
Duration: 1 min 5 s
Channel: Mashable
Description: A rare second full moon of the month will rise later this week, but what causes an actual blue moon?

Mashable

A rare second full moon of the month will rise later this week, but what causes an actual blue moon?

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