Today is Pi Day, the unofficial holiday used to observe the Pi ratio, 3.14. The 14th of March is 3-14, hence the designation.

The US House of Representatives once voted to observe today as Pi Day, which makes 3.14159 the smallest number they ever voted on. Maybe they thought they were spending 3.1415 billion dollars.

I remember only the first 9 or so numbers of pi, but who *doesn't *forget the numbers of the Pi ? According to Wikipedia and a few other websites, Daniel Tammet recited the first 2,964 numbers of Pi in 2004 on Pi Day. I've read that somebody recited 83,431 digits of pi, taking about 13 hours to do it. That reminds me of the novel *Fahrenheit 451,* by Ray Bradbury. A secret group of book lovers memorized entire books to preserve them during a wave of book burnings.

Imagine memorizing and reciting this:

3.

14159265358979323846264338327950288419716939937510

58209749445923078164062862089986280348253421170679

82148086513282306647093844609550582231725359408128

48111745028410270193852110555964462294895493038196

44288109756659334461284756482337867831652712019091

45648566923460348610454326648213393607260249141273

72458700660631558817488152092096282925409171536436

78925903600113305305488204665213841469519415116094

33057270365759591953092186117381932611793105118548

07446237996274956735188575272489122793818301194912

98336733624406566430860213949463952247371907021798

60943702770539217176293176752384674818467669405132

00056812714526356082778577134275778960917363717872

14684409012249534301465495853710507922796892589235

42019956112129021960864034418159813629774771309960

51870721134999999837297804995105973173281609631859

50244594553469083026425223082533446850352619311881

71010003137838752886587533208381420617177669147303

59825349042875546873115956286388235378759375195778

18577805321712268066130019278766111959092164201989

38095257201065485863278865936153381827968230301952

There are other ways Pi Day is being observed besides recitations. Schools and museums are conducting programs that show the relevance of Pi to anything from architecture to movies to astronomy. Bakeries are selling pies with the Pi ratio.

Here's how I celebrated the *coming* of Pi Day.

The calendar of my iPod Touch in front of a license plate that I noticed during a morning walk on the 9th. The image is centered on March 14th, so what is behind the iPod?

Could this be the license plate PI?

No, that was a once-in-a-lifetime moment, when I met the owner of a car with the plate PI. He confirmed it was a reference to the Pi ratio, and not to private investigations. Still, this Pi plate is connected to the one behind it.

This Pi Day plate gives us the mathematical formula for calculating the area of a circle: pi multiplied by the radius squared.