A couple of years ago I suggested that if the queen's chamber shafts were intended to target Sirius and Kochab, and if the shafts were symmetrical, then dating would not require reliance on exact survey data or reliance on the AEs to have been able be to construct the shafts with exactly the desired angle. All that needs to be done is to look and see when Sirius and Kochab were at the same angle above the horizon at culmination. The old software I used gave me a date of 2437 b.c. but I recently downloaded some improved software and it gives a date of 2450 b.c. It also seems to me that since the culmination angles of the two stars had been getting closer to each other for several hundred years, the time when the two stars were at the same culmination angle may have been something that the AEs would have wanted to memorialize. In 2450 b.c., when the angle of the two stars was the same, the angle was approx 39.35 deg, which is close to Gantenbrink's survey data and also close to the slope of 9/11 that I think was used for construction.

I noticed that at different latitudes the time when the two stars have the same culmination angle changes, but the angle is the same approx 39.35 deg. It occurs to me that the observations of the stars and the calculations of the angles may have been done somewhere other than Giza, say at Heliopolis for instance, and then simply transfered to plans for construction at Giza. Given 45 deg and 32.28 deg for the KC shafts, if the observations were done at Heliopolis, the difference in dates for Alnitak and Thuban narrows by about 60 years over the difference if the calculations were done at Giza. If the observations were done around latitude 30.3 deg, the dates for Alnitak and Thuban are the same, around 2425 b.c. Just a thought.

I have recently uploaded a webpage about the geometry of the shafts with a section about astronomical orientation of the pyramid and the alignment of the shafts. Here is the URL, take a look:

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