*But why's that, James? What's so special about July 22? Uh... let's see... it's the seventh month, 22nd day, 7-22, it's a Thursday... there's nothing spectacular...*

No no no, think of the INTERNATIONAL date system.

*Well, I don't know how the rest of the world does it, but in America, I usually take my date to--*

URGGGGHHHH

*YOU IDIOT. In America, we put the month first, then the day, e.g. 7/22; in other places, such as Europe, it's the other way around, i.e. 22/7 (notice, if you will, the correct usage of e.g. and i.e.), which is--*

*OH I KNOW! That's pi!*

Well... not exactly... it's a [bad] approximation of pi. Let's compare actual pi to the approximation (or at least what I remember of the actual pi)

3.1415926535897932384626433832795028841971693993571058...

3.1428571428571428571428571428571428571428571428571429...

A quick study of the second number, generated by 22/7, will show that it is a repeating decimal, repeating 142857 over and over and over and over and...

Notice, however, I said that this is a day to be celebrated by

*some*people, i.e. math-appreciating people/nerds. I celebrate it merely because it's cool. (OK, OK, it's cool in MY opinion). I don't like 22/7 as an approximation of pi, though, but to this day, it remains a simple approximation useful in quick and dirty simple calculations involving the ratio of the circumference of a circle to its diameter... in fractions. The reason I don't like it is because it is just a repeating decimal, taking advantage of the fact that anything over 7 would produce 142857 or any rotation of that repeating decimal (142857, 428571, 285714, 857142, etc.)

I guess it's also the only Pi Day available in Europe. March 14 (14/3) wouldn't be exactly right...

Let's now look forward to the REAL PI DAY, 3/14/15. Hopefully, I'm still alive and well.