Blue Moon
A blue moon is an additional 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.The phrase has nothing to do with the actual color of the moon, although a literal "blue moon" (the moon appearing with a tinge of blue) may occur in certain atmospheric conditions: e.g., if volcanic eruptions or fires leave particles in the atmosphere of just the right size to preferentially scatter red light.
Image of a Blue Moon
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