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### Pi Day

"It’s exact and indefinite. It’s like pi- you can keep figuring it out and always be right and never be done."

Today, March 14, represented in month date form as 3/14 or 3.14, is designated as Pi Day, a good day to contemplate this irrational number or simply to bake and eat some pie (in a rational or irrational manner). This mathematical constant, the ratio of a circle‘s circumference to its diameter, approximately equal to 3.14159, has been represented by the Greek letter “π” since the mid-18th century though it is also sometimes spelled out as “pi." Mathematicians have been fascinated by this number since ancient times as this irrational number's decimal form, neither ends (like 1/4 = 0.25) nor becomes repetitive (like 1/6 = 0.166666...). Both the Babylonians and Egyptians had rough numerical approximations to the value of pi, and later mathematicians in ancient Greece, particularly Archimedes, improved on those approximations. By the start of the 20th century, about 500 digits of pi were known. And today, with computation advances, as of January 2020, we now know more than 50,000,000,000,000 digits!

Today's special date, March 14th, also known as Pi Day, is designated for the transcendental number, starting with the digits forming today's date (in the month/day/year system) = 3.14159 ...

Recall that pi is the ratio of a circle’s circumference to its diameter.

By designer Carol A.L. Martin "this whimsical tartan was created in honour of"Pi Day" March 14th, 2010. On that day mathematicians celebrated the calculation of pi to more than 200 billion digits by supercomputers! In this design, all colours begin with the letter "P".."

Pi (uppercase Π, lowercase π) is the sixteenth letter of the Greek alphabet, representing [p]. The letter "π" is the first letter of the Greek words "περιφέρεια" 'periphery' and "περίμετρος" 'perimeter', i.e. the circumference.

The designer used the colours: Pewter Blue, Pacific Blue, Privet, Pineneedle, Pastoral Green, Pastel Green

For those hunting for their own pi (or pie today), click above to enjoy the beautiful "Found Pi" photo of "Pi in the Woods," in its original black and white by John Westrock.