"Pi" Day..

[Karlsweldt]

Once every 100 years, this is a special day for math aficionados.. "Pi" day.
The third month, the 14th day, the year ending in 15. So 3.1415.
It is a ratio of diameter to circumference of a circle. But the true number goes out to infinity..
3.14159265358979323846264338327950288419716939937510582097.....

[rascard2007]

Well with the date format used in spanish dd/mm/yy it has to be on 31/4/15 a little forced

on anyway I heard some days agot that the scis are analizaing the choice of use 2 * Pi instead of Pi as a way to simplify? the operations, The Tau number