Dec 76
| Polar Flattening | = (a—c)/a |
| = 0.005 to 0.009 | |
| depending on source. |
Some observers put the figure as high as 0.013, but this might be because the oblateness of the Martian atmosphere is much greater than that of the surface.
Inner square indicates core dimensions at corners.
| (a − c) | = 33.65 inches (mean) | Petrie |
| a | = 4534.4 inches (mean) | Petrie |
| (a − c)/a | = 0.007421 |
The metre was defined in 1793 as being, in effect, one 40 millionth of the Earth’s meridian. Measurement techniques have improved since then, but this definition is still accurate to within about 0.02% .
The cubit used for building the Great Pyramid is approximately one 40 millionth of the Martian meridian.
Using Petrie’s cubit of (0.524053m ± 0.02%), the height above the equator indicated by the slope of the Great Pyramid (see Fig 2) is about 1.3% greater than 40 million cubits. And the Giza–Teoti’ Intersection Height (see Fig 3) is about 0.4% below 40 million cubits.