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Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant π (pi) (in the mm/dd date notation: 3/14); since 3, 1 and 4 are the first three decimal digits of π. March 14 is also the birthday of Albert Einstein and the two events are sometimes celebrated together.

Observation

Pi Approximation Day is observed on July 22, because of the Ancient Greek mathematician Archimedes’ first rough approximation of π as being 22/7. [Archimedes was able a few years later to calculate a much-better approximation of π.] However, this may be considered misleading, as all cited dates are “approximation days” (since π is an irrational number) and 22/7 is actually a closer approximation of π than 3.14 is. Typically, March 14 is more popular for countries using the month/day format and the 22nd of July is more popular for countries using the day/month format.

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