In the 13th century, the infinite number pi was calculated by the mathematician Ludolph van Ceulen to 35 digits. Here is a website that expresses pi to a million digits. Computers have determined pi to a trillion digits, apparently (but who knows for certain!).
And special pi occurs at the time 9:26:53 (both a.m. and p.m.) on March 14th, when we'll pass through time reflected in the first ten digits of pi: 3.141592653 ... These calendar and time numbers will not be repeated for 100 years. So enjoy tomorrow at 26 minutes and 53 seconds past 9 a.m. and 9 p.m.
How many digits of pi did you memorize in school? How many do you still remember?