<Hugh has identified that the unit used at Giza is derived from the hexagon produced by bees building hives and the barleycorn unit tells u the time at stonehenge as 86400 barleycorns are Michell's 31680 units within the canon.
31680 x 34/33 is 32640 Thom's megalithic yard expressed in inches.
So lots falling into place since i have had access to your workings.
31680/86400 = 0.36666r and this is the ancient barleycorn and 40 of these produce the eclipse unit as 14.666r.
The distance between old sarum and Stonehenge is 31680 feet or 6 miles and English Heritage have this in their literature.
The suggestion is Old Sarum as the namme suggests represents the sun or Eye of horus if you look at Old sarum from above.
Old Sarum was possibly the centre of the UK megalithic world and Brodgar the extremity. This is exactly the opposite to what our archaeos suggest.>
Always an interesting take on Megalithic measures. The ratio .3666r being the inverse Earth/Moon diameter ratio as 11/30, although Jacob prefers the obverse idea of a MY as, 2.7272r. Ft. Also suggested by Michell long ago. 375/374 to your unit of 2.72 Ft. Hm, maybe Stonehenge and Old Sarum were early predecessors of today's modern particle accelerators, LOL! Just kidding, I think? Although I did initially determined the SOL calculation, being also a 1/32th. fraction of the Proton/Electron mass ratio 1/1836 = 57.375 in my first study of this unit earlier last year. Hmm! It is as HF suggests, hexagonal geometry and Vesica calculations. 1836/17 = 108, as an obvious Imp. factor of the Canonical radius of the Moon in Miles.
I'm never really sure where these investigations will lead to next, but it is a lot of fun exploring all the same.