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Biology 21 Online
OpenStudy (anonymous):

What is a "blue moon" or when does a blue moon occur?

OpenStudy (anonymous):

A blue moon can refer to the third full moon in a season with four full moons. Most years have twelve full moons that occur approximately monthly. In addition to those twelve full lunar cycles, each solar calendar year contains roughly eleven days more than the lunar year of 12 lunations.

OpenStudy (anonymous):

oh thanks for your help! :)

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