February 20, 2020 04:02PM
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Registered: 19 years ago
Posts: 1,989
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Hi Graham,
“I like your theory and remember looking at it many years ago.”
Amazing, as I had almost forgotten it and I thought I had lost it until I came across it on the web-archive.
You noticed that Khafre sticks out like a sore thumb. I vaguely remember someone recently suggesting that Khafre’s pyramid was built before Khufu’s, but I don’t remember who and in what discussion and for what reason.
Anyway, apart from my failing memory, using modern astronomy software, its possible to determine when the vertical alignments took place taking into account the deviations from due north of the pyramids with an accuracy down to a few arc seconds. However, ancient surveyors could only hope for accuracy to within a few arc minutes if they were lucky.
They probably used a vertical straight edge set up with a plumb bob and when the 3 stars were simultaneously eclipsed by the straight edge they could then stretch a cord between the edge of the straight edge back to the observer and they would have their direction line. However, if their sighting was off by only a few arc minutes it would affect the dates. For example, if Khafre’s pyramid was set out c.2570, 30 years after Khufu, the vertical alignment would only be off by about 1.5’, which is negligible.
We have to allow for the primitive equipment they were using that on a good night sightings might be accurate to within a few arc minutes, but even a few arc minutes here or there can radically affect the dates.
Graham: “I note your comment that Djedefre might have taken over an early dynastic tomb. But that would have meant that the 45 degrees to Khufu's pyramid was fortuitous !”
Possibly, but if so, they would have taken it as a sign from the gods!
A lot to explain here but no time at the moment.
Chris
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