We found it, it is coming from your analysis and Hugh's and I have been comparing the two and looking for commonalities. It seems to be a certainty now. Also looking at Witteeven's work which is quite something and our calculations support his. He uses 3.1416.
For me the tipping point is Petries 755.75 imperial feet and most of my time has been spent working on why this only gives 36276 inches but you find a larger cubit at 20.625. It is a real conundrum but your calcs are certainly correct.
Also Petrie's second set of figures slots exactly into place finding 111.111r imperial miles using the canon.
33333.333r imperial feet as a unit of measure is pretty irresistible especially when the Nippur cubit and Egyptian pi multiplied together is the base unit in the imperial system.
it gives (5 to the power 4) x 10 Thom's sacred unit.
It seems that the imperial inch holds to 755.75 then the variable inch comes into play. The megalithic yard is there all the time as a variable. You have it at 275 being 100 variable MY. The GP, very probably, is an infinite design, it has to be.
Perhaps we have to imagine it continuing through the Earth and coming out the other side and just carrying on forever but that is beyond the scope of what we are looking at.
The Petrie measurement could be adjusted to 9068.8888r x 4 = 36275.55555r
So in feet 36666.666r imperial inches = 3055.555r imperial feet and 36275.555r = 3022.962963
difference is 32.59259259 and divided by 1.11111r = 29.3333r exactly one lunar eclipse month.
This calc is 0.0888r away from Petrie's measure but we are looking for eclipse calculation intention and it is there.
You can't find 29.333r there unless you know what to look for, just look how completely the designers have hidden it using 1.111r the UOIO. We are not making this up it is there, and was in the original design.
Edited 4 time(s). Last edit at 09-Jan-19 13:19 by DavidK.