I just found an error using the rotation of 1.2061111 degrees listed by Petrie for the Station Marks!

Listed under “Chap. 5. Co-ordinates” it has + 1º 12' 22" ± 6" = 1.2061111 degrees for the rotation of his station marks.

However when I checked with his “Chap. 13. Positions and Orientation of the Pyramids” he has this.

Centre of First to centre of Second Pyramid 13931.6 and 13165.8 = 19168.4 at 43º 22' 52"
Centre of First to centre of Third Pyramid 29102.0 and 22616.0 = 36857.7 at 37º 51' 6"
Centre of Second to centre of Third Pyramid 15170.4 and 9450.2 = 17873.2 at 34º 10' 11"

When I checked his angles from center to center of pyramid I found that I had to rotate all his station marks by 1.1251444 degrees to achieve these angles.

So my map listed with “Map rotation = 1.2061111 deg. counter-clockwise” is wrong and the measurements are also wrong. New values to come in the future.

Sorry for the error.

RLH