Once again, Pi Day has arrived!

As you probably know, pi (π) is a mathematical constant found in circles and throughout mathematics! Since pi’s decimal expansion starts off 3.14…, and today’s date is 3/14, we celebrate pi and all things mathematical on this day!

#### My Top Pi Ways to Celebrate Pi Day

1. Share pi (and pie) with friends

2. Read and learn more about pi

3. Contemplate the wonder of the universe and mathematics’ role within it

.14159…. Shout “Happy Pi Day!” and/or “Happy Pi Moment” at the top of your lungs when the appropriate time occurs

#### Pieces of Pi

Related to #1 and #2 above, here are a few cool tidbits about pi and pi day:

- Check out this piem, that is, a poem where the number of letters in each word yields the sequence of pi’s digits. Though I’ve discussed several of these before (most notably,
*Poe, E. Near a Raven*), I had not run across this century-old piem before this week! - Relatedly, here’s a statistical analysis on the probability of writing piems or other pilish phrases by accident!
- If you’re a fan of mathematical art, check out this Numberphile video explaining some of the art I’ve featured in today’s post, and also this gallery of mathy art from this winter’s Joint Mathematics Meetings in Baltimore!
- Challenge yourself with some pi sudoku puzzles from Brainfreeze from years past! Or with the online Pi Day Challenge!
- Listen to a new recording of the sound of pi (this one uses pi in base 12 to match up with the chromatic scale)!
- Read this article about pi’s normality (whether each digit or combination of digits appears equally in the decimal expansion of pi) from this month’s American Mathematical Monthly!
- Today I had my students throw toothpicks at some lines (the Buffon’s Needle experiment, described here and here; the connection to pi is explained here). Fun!
- Some other ways to celebrate can be found in my (Pi Day – 2) post here!
- Thanks to the math department at my alma mater, Williams College, for featuring this post on their website!

#### Pi Past

I cannot believe it’s been 10 years since my first pi day expansive email that set up (or continued) a crazy propaganda war between the mathematical constants pi and e. (Going back even further, by my count I’ve been celebrating pi day in some form or another for almost 18 years now!) Just about each year since 2004 I have sent out my annual missive on Pi Day, by email and/or by blog (a few years when March was especially busy for me, I sent out messages on other pi-related days). A list can be found in yesterday’s pre-pi-day post here.

Have a great Pi Day today, and many more!

Nick

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