Outside the US, Pi Day should probably be July 22 (22/7)—this fraction is a surprisingly good estimate of pi. You can find the value of pi with a mass and a spring.

Here are two methods for calculating pi. One is a measurement of circular objects and the other is a python calculation.

Google Cloud Developer Advocate Emma Haruka Iwao has set a new world record for calculating the most digits of pi ever, demonstrating the capabilities of Google Cloud infrastructure.