Pi Day this year is a once-in-a-century numerical phenomena: the date falls in sequential order of the first five digits of pi: 3/14/15. March 14 has been celebrated as Pi Day for many years, but in 2009 the U.S. House of Representatives officially recognized this day as National Pi Day. Many will celebrate at 9:26:53 a.m. in continuation of the series of numbers: 3.141592653.
