October 15, 2020 09:42AM
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Registered: 12 years ago
Posts: 342
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There is a serious lack of survey data for the shafts. Petrie plotted the exits in the 102 and 103 courses (averaging 157.27 cubits above base so that the horizontal distance between exits is 200 cubits. Gantenbrink's geometric plan requires higher exit points at 154 cubits above base. (The shafts were investigated again by the Djedi team who have not yet revealed detailed results to the public, saying the angle of the two lower shafts 'is around 40 degrees' !). This was discussed here -
[
www.hallofmaat.com]
I came across this PDF which seeks to address the discrepancy between Petrie's and Gantenbrink's figures -
[
www.giza-pyramids.com]
- briefly, the author claims that Smyth made a surveying error at the start of the Ascending Passage, which placed the entire upper passage system south of its present position, implying that Gantenbrink thought he was further from the south casing than he actually was, so the theoretical shaft/casing intersection became higher than Petrie's figure measured on the outside of the pyramid.
I don't agree with the author's explanation for the discrepancy but he does make some important points. He acknowledges that Gantenbrink's survey of KC south was meticulous and full details are presented here -
[
www.cheops.org]
He shows that the upper shafts converge 5 cubits below the floor of the King's Chamber -
The vertical axis through the convergent point is defined by the root 2 division of pyramid height -
Gantenbrink states that KC south has slope of 45 degrees. This is shown below in red -
- the black line represents a 45 degree shaft located according to Petrie's measures. One can easily see that the convergence point is about two cubits lower than it actually is. Many seem to cling to Petrie's figures because they produce a distance between shaft exits whose only merit is a nice round number, about 200 cubits, which otherwise does not relate to the known geometry of the pyramid. Conversely Gantenbrink's scheme is geometrically elegant and defines the very shape of the pyramid -
Until this question is solved there seems little point in discussing stars and building dates.
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