The imperial x 34/33 is the system discovered by Thom
Pi as 1632/520 works with this system
Pi as 1760/560 works with the imperial
restated as 220/70 and 408/130
220 x 408 = 89760 and this is the Aubrey circle at Stonehenge in 100th's of an imperial foot.
not forgetting what Graham tells us
Edited 2 time(s). Last edit at 23-Dec-17 10:48 by DavidK.