Once in a blue moon
Once in a blue moon : Phrases
To happen only on rare occasions.
The Post Office regularly fails to deliver cheques sent in payment to me, but bills sent to me fail to be delivered only once in a blue moon.
Two full moons in the same month are extremely rare, though they do happen. A second full moon has come to be called a blue moon. This is apparently because the Maine Farmers Almanac used to list the date of first moon in red text, and the second moon in blue.
The first published use of the phrase was in the 1600's Rede Me and Be Not Wrothe and English poem by Roy and Barlow that in part says If they say the moon is blue, we must believe it is true the they in this poem referring to English nobility.
Also, the moon on rare occasions actually appears to be blue. For example, if there was a volcanic eruption somewhere, suspended ashes in the atmosphere can make the moon appear bluish.
Related Phrase : Blue Moon
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