March 14, 2019
Ah, pi (Π, π). The delicious 16th-letter of the Greek alphabet and the infamous, endless, irrational mathematical constant – also known as the ratio of a circle’s circumference to its diameter, 3.14159.
Mar 14th is the annual observance of the 4000-year old constant, as the date “3/14” are the first three digits of pi, “3.14”. That leaves us with just one question that, unlike the question “how many digits are in pi?” actually has an answer: how does one celebrate Pi Day?