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blue moon

noun
- 1. a phenomenon whereby the moon appears bluish owing to smoke or dust particles in the atmosphere: "people saw blue moons for years after the 1883 eruption of Krakatoa"
- 2. a second full moon in a calendar month: "tomorrow's full moon is a blue moon"
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Blue moon
Extra full moon that appears in a subdivision of a year: either the third of four full moons in a season, or a second full moon in a month of the common calendar
A blue moon refers either to the presence of a second full moon in a calendar month, to the third full moon in a season containing four, or to a moon that appears blue due to atmospheric effects. Wikipedia
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