Flattened Circles

Thom found these were of two main designs, Types A and B,  which reduced the perimeter of a circle defined by an initial radius/diameter. Because they are fixed in their geometry, the ratio of perimeter reduction achieved and the equivalent "pi" between the circle and its flattened counterpart, can be stated as perimeter reduction PR:

  • Type A: PR = 0.9114 ("pi" is then 3.0591)
  • Type B: PR =  0.8604 ("pi" is then 2.9572)
  • Type D: PR= 0.9343 ("pi" is then 3.0840)

[MSB, p28-9

Title Created Date
Thom's Stone Circle Geometries: 1. The Problem 04 April 2014
Thom's Stone Circle Geometries: 2. Using a Grid of Squares 18 October 2014
Thom's Stone Circle Geometries: 3. Tracking the Sidereal Day 19 January 2015
Thom's Stone Circle Geometries: 4. Role of Metrology within Type A 19 January 2015
Thom's Stone Circle Geometries: 5. Repositories of Ancient Knowledge 19 January 2015
Long Meg: How to Make a Type-B Sidereal Observatory 10 November 2015