March 14 is celebrated as Pi Day in the United States as the numerical date 3-14 matches the first 3 digits of the mathematical constant pi, which is the ratio of a circle's circumference to its diameter.

Last year was especially significant as the numerical form of March 14, 2015 matched Pi's first five digits 3-14-15.

However, Saeja Kim, Chair of the Mathematics Department at the University of Massachusetts at Dartmouth told WBSM's Phil Paleologos this year's Pi Day is also special.

“Lots of mathematicians agree that today is Rounded Pi Day because 3.1416, which is coming out to 2016, is rounding out those four digits after the decimal point,” said Kim.

The day is also the birthday of Albert Einstein.

However, Kim says all of us can lay a birthday claim to Pi Day.

“Everybody’s birthday, including the year, can be recognized somewhere in the number extension of pi, and I think that’s amazing,” said Kim.

The U.S. House of Representatives passed a non-binding resolution in 2009 recognizing March 14, 2009 as National Pi Day.