March 14 is the International pi day and the International Mathematics Festival. π is approximately equal to 3. 14, so March 14 is the most appropriate day to commemorate pi day. International pi day can be traced back to1March, 988 14. Larry Shaw, a physicist at the San Francisco Science Museum, organized museum staff and participants to make 3 and 1/7 laps around the museum monument (22/7, one of the approximate values of π) and eat fruit pies together. Later, the San Francisco Science Museum inherited this tradition and held a celebration on this day every year.