880/280 = 22/7 twice. Also 2 x Pi x r is the formula for the circumference of a circle so 560 gives the diameter for the 1760 base perimeter.
1760 / 560 if described in imperial inches is 14.666r / 4.666r imperial feet the unit suggested as the eclipse unit because 14.666r x 449 is the saros as 6585.333r days.
So this suggests that 22/7 is an ancient mathematical ratio as an approximation for Pi.
But there is another that is suggested by Jim Wakefield and this is 3.14181818r and he calls it Fibonacci Pi. i know 1440 is part of the Fibonacci series and this approximation requires investigation.( update Dr Troglodyte pointed out this is incorrect. Thank you and for your welcome. It should read 144 )
It can be compared with 22/7
22/7 = 3.142857143 - 3.14181818r = 0.001038961
3.142857143 / 0.001038961 = 3025
3.1418181818 / 0.001038961 = 3024
These units are exact. Not something you would see in a modern mathematical text book.
There is another unit suggested in my book 'The Eclipse' and it is 3.1416.
This can be presented as a smoothing of real pi by using Thom's megalithic inch of 0.816.
Real Pi 3.141592654 / 0.816 = 3.849990997 rounding to 3.85
3.85 x 0.816 = 3.1416.
This unit is hidden on page 47 of Thom's book 'Megalithic Sites in Britain'
Also on page 47 is the Aubrey circle circumference of 897.60 imperial feet.
3.1416 / 3.5 = 0.8976 units
897.60 / 0.8976 = 1000 and Thom suggested that base 10 was universally sacred.
How much evidence is required? There is much more.
Edited 3 time(s). Last edit at 15-Jan-18 14:56 by DavidK.