Q: When is there a blue moon?

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please collaborators i have a question about: when is there a blue moon?,please quickly, thanks
A "blue moon" is a second full moon in the same month. Usually, there is just one full moon a month. But due to differences between the length of calendar months and the length of the lunar month, a second full moon can occur in the same month. This happens once every 2.7 years.
For occurrences until 2015 see en:Blue moon#Blue moons between 2009 and 2015. ...

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