A blue moon refers to the presence of a second full moon in a calendar month, the third full moon in a season containing four, or a moon that appears blue due to atmospheric effects. The calendrical meaning of "blue moon" is unconnected to the other meanings.
A blue moon refers to the presence of a second full moon in a calendar month, the third full moon in a season containing four, or a moon that appears blue due to atmospheric effects. The calendrical meaning of "blue moon" is unconnected to the other meanings.
Source: Wikipedia "Blue moon" · CC BY-SA 4.0
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