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[Originally], in a season in which four full moons occurred, the blue moon was [the third] of these. In 1946, an error in the magazine *Sky and Telescope* led to the term referring to the second blue moon in a month. Today, the phrase 'blue moon' is used to refer to an event that happens quite rarely. Interestingly, by either of the [definitions] given above, it would ean something that occurs on average every 2.5 years.
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