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There are two days held in honour of the mathematical constant π (Pi): Pi Day and Pi Approximation Day.
Pi day
March 14, written 3/14 in the USA date format, is the official day for Pi day derived from the common three-digit approximation for the number π: 3.14. It is usually celebrated at 1:59 PM (in recognition of the six-digit approximation: 3.14159). Some, using a twenty-four-hour clock rather than a twelve, say that 1:59 PM is actually 13:59 and celebrate it at 1:59 AM instead. Parties have been held by mathematics departments of various schools around the world.
March 14 is also Albert Einstein's birthday.
This day has been celebrated in a variety of ways. Groups of people, typically pi clubs, give thought to the role that the number π has played in their lives and imagine the world without π. During such an event, pi celebrants may devise alternative values for π, eat pi (pie), play pi (piņata), or drink pi (piņa colada).
The "ultimate" pi day occurred on March 14th, 1592, at 6:54 AM. When written in American-style date format, this is 3/14/1592 6:54, which corresponts to the ten-digit approximation of pi: 3.141592654.
Pi Approximation Day Pi Approximation Day is one of two days: either July 22 (written 22/7 — 22 divided by 7 is an approximation to π — in some date formats), or April 26, the day on which planet Earth completes approximately two Astronomical units' worth of its annual orbit: on this day the total length of Earth's orbit, divided by the length already travelled, equals π.
See also
External links - The Ridiculously Enhanced Pi Page (http://www.exploratorium.edu/learning_studio/pi/)
- Pi Day in Maine with Dr. Wilson's Memory Elixir (http://www.memoryelixir.com/archive4.html#pi/)
- Friends of Pi – Freunde der Zahl Pi (http://pi314.at/)
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