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A [[moon]] that is colored pale blue. The idiom, "Once in a blue moon," refers to a rare occurrence, since an actual blue moon refers to the third full moon in a season that has four full moons instead of the usual three. h4.See also * [[red moon]] * "Wiki article":http://en.wikipedia.org/wiki/Blue_moon Updated by bot Sun, Sep 18 '22, 02:56 |