March 14th is National Pi Day. Celebrate this mystical number by reading 10 fun facts about pi!
- Pi is the number of times a circle’s diameter will fit around its circumference.
- Generally, Pi is rounded as 3.14 but no one has ever found the end. In October, 2005, a mathematical team in Tokyo have calculated pi to 1.24 TRILLION digits!
- Pi was known of as far back as ancient Egypt, Babylon, India and Greece. Earliest known approximations are 1900BC: Babylonia had 25/8, Egypt had 256/81. Each are within 1% of the true value.
- Memorizing a record number of digits is now a competition. The Guinness World record is held by Lu Chao, who took 24 hours to recite to the 67,690th decimal place of pi!
- 2009 is the first year the U.S. Congress is officially recognizing Pi Day.
- The first Pi Day celebration was heald at the San Francisco Exploratorium in 1988. The annual Pi Day menu now includes fruit pies and pizza pies!
- Some also celebrated Pi Minute or even Pi Second, which occurs on March 14 at 1:59:26pm. (3.1415926)
- There is also a Pi Approximation Day. As pi is roughly equal to 22/7, the other holiday is celebrated on July 22.
- MIT has been known to mail out acceptance letters to be delivered to students on Pi Day.
- Pi Day is coincidentally Albert Einstein’s birthday!
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