The answer is very mathematically simple but comes out of years of study, and much luck as well.
10/9 x 10/9 = 100/81 and there is the denominator.
10/9 x 10/9 x 8 = 800/81 and there is the GP base ( base number embedded forever in it is 8 )
What is required to make this unit into 256/81
Divided by Babylonian Pi 3.125.
Babylonian Pi x Egyptian Pi = 9.87654321.
800/81 x 1000/3125 = 256/81 and there is Thom's sacred base 1000 in the design as well.
Hendrik is absolutely correct in his analysis and he is very well qualified to make his comments and he puts it perfectly without the numbers.
It is possible to predict an eclipse at Stonehenge using number 56 only . Professor Sir Fred Hoyle wrote about it in his book 'On Stonehenge' in the 1960's.
Why his work and that of Professor Thom's is completely ignored is the biggest mystery to me. It is all in their books.