AM I THE ONLY ONE LOST BY THIS? LEMME HELP :- "Circumference of a circle or a sphere , is 2 π r .... "π" this weird looking symbol is called "pi", it is a constant, and valued as 3.1415 ..... and goes on
now the more fine value of pi you use, the more refine the results will be.
what the post says, is "if you use the value of Pi, up to 40 digits, or 39 digits after decimal, you can calculate the circumference of observable universe with very small margin of error of only hydrogen atom"
Hydrogen atom = smallest atom with a radius of 53*10^(-12) meter
or 0.000000000053 meters
so this is the error in calculation of circumference.
or if you don't know what circumference is, "what the heck are you doing on this page?" circumference is length of boundary of a circle."