Most of us are intrigued by different celestial phenomenon, so much so that literary legends have used them figuratively to beautify various languages. One such often used idiom is "Once in a Blue Moon". But moon is white, isn't it, or is it blue on certain occasions? 

The first mention of this idiom can be dated back in 1528 by William Loy and Jeremy Barlow, the language was middle English.

Listen in to understand why this idiom is used figuratively in English language.

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