Every March 14 is international Pi Day when math
enthusiasts around the world celebrate the famous
constant Pi, equal to the ratio of the circumference of a
circle to its diameter. Pi Day is celebrated on March 14 because its
first 3 digits are 3.14 *(representing March 14th using month.day
notation)*. March 14 is also Albert
Einstein's birthday *(he would be 135 years old in 2014)*. Pi is an
irrational number, meaning that the sequence of its decimal digits
continues forever without repeating itself.

3.1415926535897932384626...

- Pi Facts & Pi Day Activities at the Exploratorim
- Joy of Pi
- Pi Day on Wikipedia
- Pi.ytmd
- Interactive visualization of 4 million digits of Pi
- The Art Of π, φ And e
- Visualizing Pi Infographic
- Pi Day stuff you can buy
- Don McMillan: What is Pi?
- Pi Day Challenge
- Pi Day Is Coming -- But Tau Day Is Better
- Pi Day Mashup

- 2014: Celebrating Irrational, Transcendental Pi
- 2012: Pi Day Exploratorium webcast
- 2011: 5 Videos To Help You Celebrate March 14
- 2010: Pi Day: Google Doodle Celebrates Math Nerds Everywhere
- 2010: Japanese Engineer and US Student Claim to Calculate Pi to 5 Trillion Digits
- 2009: Pi Day pictures 2009
- 2008: Thank God it's Pi Day!
- 2007: Fans of Pi Have Their Day

The domain name "3.14inthesky.com" is a play on the phrase "pie in the sky" — a fitting metaphor for this special transcendental number and natural embodiment of the infinite. No matter how good we get a computing the decimal digits of Pi, there will forever be one... more... digit...

The background image for this page is a graphic representation of 1,310,720 digits of Pi, where each digit is indicated by a pixel of a different color. It was obtained from here.

This website is a production of TeamHuman.org, in recognition of contribution of math to the success of humanity.