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Happy Pi Day!

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Tomorrow, March 14, is World Pi Day. For those not in the know, pi (π) is the Greek letter that stands for the ratio of the circumference (distance around) of a circle to its diameter (width). Pi is an irrational number, which means that it can't be expressed as a fraction. That also means that its decimal representation never ends or repeats - it continues on, and on, and on. Forever.

Here's the first few hundred digits of pi:
3.1415926535897932384626433832795028841971693993751058209749445923078164
062862089986280348253421170679821480865132823066470938446095505822317253
594081284811174502841027019385211055596446229489549303819644288109756659
334461284756482337867831652712019091456485669234603486104543266482133936
072602491412737245870066063155881748815209209628292540917153643678925903
600113305305488204665213841469519415116094330572703657595919530921861173
819326117931051185480744623799627495673518857527248912279381830119491298
336733624406566430860213949463952247371907021798609437027705392171762931
767523846748184676694051320005681271452635608277857713427577896091736371
787214684409012249534301465495853710507922796892589235420199561121290219
608640344181598136297747713099605187072113499999983729780499510597317328
160963185950244594553469083026425223082533446850352619311881710100031378
387528865875332083814206171776691473035982534904287554687311595628638823
537875937519577818577805321712268066130019278766111959092164201989380952
572010654858632788659361533818279682303019520353018529689957736225994138
912497217752834791315155748572424541506959508295331168617278558890750983
817546374649393192550604009277016711390098488240128583616035637076601047
101819429555961989467678374494482553797747268471040475346462080466842590
694912...

Why is Pi day on March 14? Because, if you round, then Pi = 3.14, which of course is March 14. March 14 at 1:59 is known as "Pi minute" (3.14159) and 1:59:26 is "Pi second."

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