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Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant π (pi)...

Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant π (pi). Pi Day is observed on March 14 (in the mm/dd date notation: 3/14); since 3, 1 and 4 are the first three digits of π. Pi Approximation Day is observed on July 22, because of Archimedes' popular approximation of π being 22/7. However, this may be considered misleading, as all cited dates are "approximation days" (as π is an irrational number) and 22/7 is actually a closer approximation of π than 3.14. There are a large variety of ways of celebrating Pi Day and most of them include eating pie and discussing the relevance of π. Typically the 22nd of July is more popular for countries using the day/month format (since in these countries 31/4, or April 31, is an impossible date) and March 14 is more popular for countries using the month/day format. Sometimes Pi Minute is also celebrated; this occurs on March 14 at 1:59 p.m. If π is truncated to seven decimal places, it becomes 3.1415926; making March 14 at 1:59:26 p.m., Pi Second (or sometimes March 14, 1592 at 6:53:58 a.m.). An upcoming Pi Day in 2015 will have the date 3-14-15 and a Pi Second of 9:26:53.589... a.m. The first Pi Day