A compilation of pages about Pi

Getting beyond our high school understanding: https://81018.com/starts-2
Pi Day, March 14, 2021
Pi (π) Shapes Our Universe
Let’s start at the very beginning until our universe is filled with spheres
Sphere: Our most basic building block
Pi Day 2019 Homepage
Pi Day 2018 Homepage
Pi  Overview
Pi working page

Pi equals


An arc of a
circle with the same length as the radius of that circle corresponds to an angle of 1 radian.

A full circle corresponds to an angle of 2π radians.

Currently Pi equals

3.14159265358979323846264338327950288419716939937510… plus in November 2017

  • Peter Trueb, after 105 days of non-stop calculations emerged with 22,459,157,718,361 fully verified digits of pi. That is over 22 trillion digits!
  • Emma Haruka Iwao ran her computers from September 22, 2018 to January 21, 2019 to emerge with 31.415 trillion units.
  • Newton calculated 17 and 17 digits is enough for most applications.

More facts (not guesses):

We also believe…

  • Pi is the simplest, most commonly-used dimensionless constant.
  • Pi is the bridge between the finite and the infinite.
  • The sphere is the first manifestation of spacetime defined by primordial spheres. The Planck Length and Planck Time are approximations of the smallest units of both.

This page was started in 2012.

Thank you, Wikipedia…

for the graphics (above) that demonstrate the simple definition.

Over 45 Wikipedia articles about pi

So, what do you make of it?  What is going on? Our continued discussion…