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Happy Pi Day!

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Tomorrow, March 14, is World Pi Day. For those not in the know, pi (π) is the Greek letter that stands for the ratio of the circumference (distance around) of a circle to its diameter (width). Pi is an irrational number, which means that it can't be expressed as a fraction. That also means that its decimal representation never ends or repeats - it continues on, and on, and on. Forever.

Here's the first few hundred digits of pi:

Why is Pi day on March 14? Because, if you round, then Pi = 3.14, which of course is March 14. March 14 at 1:59 is known as "Pi minute" (3.14159) and 1:59:26 is "Pi second."

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Want to impress your friends at your Pi Day celebrations tomorrow?

Here are a few random tidbits that we scraped together:

(1) The Guinness-recognized record for remembered digits of π is 67,890 digits, held by Lu Chao, a 24-year-old graduate student from China. It took him 24 hours and 4 minutes to recite to the 67,890th decimal place of π without an error.

(2) March 14 also happens to be Albert Einstein's birthday.

(3) 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, and then consuming fruit pies; the museum has since added pizza pies to its Pi Day menu.

(4) The coordinate (Pi, Pi) in latitude and longitude is in the sea just off the west coast of Africa, in the Gulf of Guinea. Check it out on Google Maps.

But you don't have to have a particular (or peculiar) love for math to celebrate Pi Day in style! We here at LAist headquarters plan to celebrate with Pi's homophonic sibling, pie. (check out Citysearch's list of five LA pies to try). Even better, Marie Callender's is giving away free slices of pie (with the purchase of any entree) on the 14th.

We may even take our pies home, and watch Pi (the movie).