Pi Day and Pi Approximation Day are two unofficial holidays held to
celebrate the mathematical constant π (pi). Pi Day is celebrated on
March 14, or in the month/day date format as 3/14; since 3, 1 and 4 are
the three most significant digits of pi. March 14 is also the birthday
of Albert Einstein so the two events are sometimes celebrated together.
Pi Approximation Day is held on July 22, or in the more common day/month
date format as 22/7, which is an approximate value of pi.

Pi Day is observed on March 14, because of the Ancient Greek
mathematician Archimedes' first rough approximation of pi as being 3.14.
(A few years later, Archimedes was able to calculate a much better
approximation of pi.) However, 22/7 is actually a closer approximation
of pi than 3.14 is. Thus, a more "accurate" Pi Day could be found in the
more common calendar, 22/7, or July 22.

Sometimes the so-called Pi Minute is also commemorated. This one occurs
twice on March 14 at 1:59 a.m., and 1:59 p.m. If pi is truncated to
seven decimal places, it becomes 3.1415926, making the Pi Second occur
on March 14 at 1:59:26 a.m. (or 1:59:26 p.m.). If a 24-hour clock is
used, the Pi Second occurs just once yearly, on March 14 (3/14) at
1:59:26 in the morning.

There is a large variety of ways of celebrating Pi Day and most of them
include eating pie and discussing the relevance of pi. Pi Day is often
celebrated with pies, given that pi and pie are homophones. The first Pi
Day celebration was held at the San Francisco Exploratorium in 1988,
with staff and public marching around one of its circular spaces, then
consuming fruit pies. The museum has since added pizza to its Pi Day
menu. The founder of Pi Day was Larry Shaw, a now-retired physicist at
the Exploratorium who still helps out with the celebrations. (From:
Wikipedia)

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