In the trapezoid diagram we find two sites with the same latitude - Delphi and Sardeis, as also two other site with different latitudes - Delos , and Djedefre's pyramid. In the first diagram below we see that as seen from Delos the altitude of Thuban at transit at 2494 BC is equal to the Khufu Queen Chamber North air shaft slope. This year agrees more or less with Djedefre's time line or that of his descendant Kafre.

We can thus say that Delos relates to the Giza pyramid epoch.

In the next pic we see how that as seen from Delphi or Sardeis the altitude of Thuban at transit at 2686 BC is equal to the Queen Chamber North air shaft slope. This year agrees more or less with upper limit of Djozer's rule. But at the same time that the angle of Thuban is 39.124 degrees aligning with the Queen Chamber’s North shaft slope, the angle of Kochab is 32.75 degrees, while the King Chamber’s North shaft slope is 32.6 degrees. Also at this day and place the altitude at transit of Dhube is equal to 58.06 degrees, practically identical to the East-Menkaure pyramid – Kafre pyramid angle(complementary angle to Menkaure-Kafre azimuth).





The Queen Chamber shafts don’t reach the surface of the pyramid probably because they refer to a different site than Giza.