Happy Pi day
Pi Day and Pi Approximation Day are two unofficial holidays held to celebrate the mathematical constant π (Pi). Pi Day is observed on March 14 (3/14 in American date format), due to pi being equal to roughly 3.14. Sometimes it is celebrated on March 14 at 1:59 pm (commonly known as 'Pi Minute'); if Pi is rounded out to five decimal places, it becomes 3.14159, making March 14 at 1:59:26 pm being 'Pi Second.' Pi Approximation Day may be observed on any of several dates, most often July 22 (22/7 - in European date format - is a popular approximation of π).