One of the mysteries of the English language finally explained.
1A 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’
2A second full moon in a calendar month.‘tomorrow's full moon is a blue moon’as modifier ‘it can be no coincidence that July is a blue moon month’
once in a blue moon
informal Very rarely.‘he comes round once in a blue moon’
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