440 Royal Cubits (20.632 inches per Cubit) per base side of the Great Pyramid of Giza, 280 for the height, so two base sides, 880, divided by 280, equals Pi, and the base perimeter length of the Great Pyramid is half a nautical mile, so it's a reduction of the dimensions fo the Earth by a factor of 43,200, derived from the rate of precession, 72 years per 1 degree of 360 degrees.
The ancients measured the radius of the Earth, according to the rate of precession, by measuring one side of a hexagon which is circumscribed by the circle of the Earth, and subdivided this length by 7,200 for the base perimeter length of the Great Pyramid, and therefrom, the length of the royal cubit.
The ancients measured the radius of the Earth, according to the rate of precession, by measuring one side of a hexagon which is circumscribed by the circle of the Earth, and subdivided this length by 7,200 for the base perimeter length of the Great Pyramid, and therefrom, the length of the royal cubit.