Pi Day

Pi Day is an unofficial holiday commemorating the mathematical constant π (pi). Pi Day is observed on March 14 (or 3/14 in month/day date format), since 3, 1 and 4 are the three most significant digits of π in the decimal form. In 2009, the United States House of Representatives supported the designation of Pi Day.

Pi Approximation Day is observed on July 22 (or 22/7 in day/month date format), since the fraction 22⁄7 is a common approximation of π.

Read more about Pi Day:  History, Date Abstractions From π, Observance

Famous quotes containing the word day:

    ““The Greeks used to say,” he said bitterly, using a phrase that had been a long time on his mind, “that when a man became a slave, on the first day he lost one-half of his virtue.””
    —John Dos Passos (1896–1970)