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 138 years old in 2017)*. 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
- Find Your Birthday Hidden in Pi

- 2017: Celebrate pi day with 9 trillion more digits than ever before
- 2016: Let's Gawk At The Beauty And Controversy Of The Math Constant
- 2016: Rounded Pi Day, by Pi Day afficionado Luke Anderson
- 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 at 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.