Today is March 14, 2011, otherwise known as 3/14. For those of you with a little bit of mathematical knowledge, that makes today “**Pi Day**” as the common form of the constant Pi is represented by “3.14”.

Pi Day is celebrated on 3/14 at 1:59 p.m., representing the first six digits of Pi (3.14159…).

Of course, if you really wanted to write it out (which is impossible by the way), it would look more like 3.1415926535897932384626433832795028841971693993751058209749445923078164…and so on and so forth without a single pattern repeating.

What exactly IS Pi? It’s simply a mathematical constant representing the ratio of any circle’s circumference to its diameter. Got that?

It appears in Einstein’s theory of relativity, among other places, which is amusing in that Einstein’s birthday falls on 3/14. See? The universe DOES have a sense of humor.

Want an easy way to get a sense for what Pi looks like? Grab the nearest calculator and divide 22 by 7. That number is Pi. Only the first few digits will fit on your calculator, though.

So, what is the purpose of Pi Day?

“It’s primarily a chance to have fun with the topic of math and science,” says **David Blater**, author of “The Joy of Pi”. “And while it celebrates Pi officially, it’s more of an excuse to get excited and show the fun side of math and science.”

The first Pi Day was celebrated in 1989 at the San Francisco Exploratorium, which remains one of Pi Day’s primary promoters. Today, Pi Day celebrations take place in countless grade schools across the country.

You can celebrate Pi Day by doing a Pi Run (3.14 miles), watching the movie “Pi”, or, perhaps by having a slice of pie. You can also check out the official Pi Day website here.

This is the “Sound of Pi” (how Pi would sound if you dialed it as a phone number of a length of 1000 digits)…

http://www.youtube.com/watch?v=WkxXlpJZPCw

Here’s another take on how Pi sounds…

http://www.youtube.com/watch?v=wK7tq7L0N8E

Here’s a fun song about Pi set to the tune of “American Pie”…

http://www.youtube.com/watch?v=hJJJmQojcLM

Here is a much more literal Pi song…

http://www.youtube.com/watch?v=vJWW3qYjwwI

Here’s clever Pi / **Eminem** parody…

http://www.youtube.com/watch?v=NBqVvAU-gdg

And, finally, here’s some “Speed Pi” from a girl who has memorized the first 500 digits of Pi (note: she’s now memorized the first 2,300 digits)…

http://www.youtube.com/watch?v=HiliHq8phgE

###### Around the Web

- Happy Pi day! (geek.com)
- Pi Day is Today (techeblog.com)
- Happy Pi Day! (onetechtip.com)
- The Weird Number (letsplaymath.net)