Thursday is National Pi Day!

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Thursday is the 14th day of the third month – 3, 1, and 4. 

Those digits are crucial because they make March 14th National Pi Day! 

Not pie as in apple pie or pizza pie, but pi as in the mathematical constant 3.14 — represented by the Greek letter for pi. 

It’s the ratio of a circle’s circumference to its diameter. 

According to National Calendar Day, the first major observance for Pi Day was in 1988 at the San Francisco Exploratorium.

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