Pi DayMarch 11, 2015
Pi Day is an annual celebration commemorating the mathematical constant π. Pi Day is observed on March 14, since 3, 1, and 4 are the first three significant digits of π in decimal form. In 2009, the United States House of Representatives supported the designation of Pi Day.
In 2015, celebrate with much pomp and ceremony as possible, as this is the only day in most of our lifetimes when pi day will fall on 3/14/15, at 9:26! 3.1415926