What is pi day ?

 

Pi Day is an worldwide annual celebration of the greatest mathematical constant π (pi). Pi Day is observed on March 14 do you know why this day only (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π 3.14 ok
and by the way it was founded by Physicist Larry Shaw in 1988

Did you know Pi has 2.7 trillion digits like this 

3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 and so on, in this way no can memorize it till date on earth. No one knows who first discovered that the ratio between a circle's circumference and diameter is constant, nor will we ever know who first tried to calculate this ratio. The people who initiated the hunt for pi were the Babylonians and Egyptians, nearly 4000 years ago.

Stephen Hawking's death, Einstein's birth, and Pi Day what is the clue out there ?