If you’re still longing for the mathematical high you felt on Square Root Day last week, the wait is almost over: This Saturday, March 14, is National Pi Day. Ready to break out your calculator and celebrate?

## Pi Day 2009: The Digits of Pi

In case you haven’t figured it out yet, March 14, 2009 is designated Pi Day because of its numerical date: 3-14, i.e. the mathematical constant of pi. The number 3.14, of course, is actually just a rounded version of the number — the figure itself has an infinite number of digits after its decimal. You can see the first 10,000 of the digits of pi here, if you’re so inclined.

## Pi Day Activities

So what’s one to do on National Pi Day 2009, aside from reveling in the joy of 3.14? Some cities are holding official celebrations. You can find a slew of other Pi Day activities for kids at this site by Scholastic. And a detailed history of pi awaits you here. If you’re still itching for mathematical satisfaction, check out this page at the Joy of Pi. It’s bursting with 3.14-related activities and information.

The official Pi Day site also offers e-cards, history info on pi, and pi-related merchandise.

Pi Day is also Albert Einstein’s birthday. You can find a whole kit of games and activities to celebrate Einstein-style here.

## Pi Songs

If you want to ring in Pi Day in a low-key fashion, so to speak, you could always try rocking out to the pi song. A guy named Felix Jung took the time to convert pi’s digits into a musical form, and you can help compose the specific tune. Go here.

Or, sit back and relax to the sounds of these Pi Song renditions:

The Pi Song:

The Pi Song (instrumental piano version):

The Pi Song (rap version)

Another Pi Song Rap:

Should all of this be giving you a headache, try the simplest celebration of all: Pi Day, apple-style. Here’s to 3.14!