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- By michael@cvcteam.com
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This year, there will be a full moon on Halloween. This makes it a “blue moon,” since it’s the second full moon in one calendar month. This phenomenon usually happens around every 2.7 years. So maybe something that happens “once in a blue moon” isn’t actually that rare after all.
However, the blue moons we know and love — when two full moons can be seen in a month — is a comparatively recent definition.