Pi Approximation Day 2025

Pi Approximation Day 2025. Join the 37th annual celebration of our own homegrown holiday! Pi approximation day is observed on july 22 (22/7 in the day/month date format), since the fraction 22⁄7 is a common approximation of π, which is accurate to two decimal places.

The rate should vary whenever either the infected or susceptible person moves, for example farther apart or closer together. Pi approximation day is celebrated every year on july 22nd because the date (22/7) is.