**Pi Day**is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (3/14 in the

*month/day*date format) since 3, 1, and 4 are the first three significant digits of π.

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^{[4]}In 2009, the United States House of Representativessupported the designation of Pi Day.

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**Pi Approximation Day**is observed on July 22 (22/7 in the

*day/month*date format), since the fraction

^{22}⁄

_{7}is a commonapproximation of π, which is accurate to two decimal places and dates from Archimedes.

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