”The builders of the Great Pyramid of Khufu aligned the great monument to the cardinal points with an accuracy of better than four minutes of arc, or one-fifteenth of one degree. The Great Pyramid’s neighbor, the Pyramid of Khafre, is aligned with an error of approximately 6 minutes, one tenth of one degree. The builders of Snefru’s Red Pyramid at Dahshur achieved an accuracy of 8.7 minutes…
How the Egyptians managed to achieve such accuracy has long been debated. In recent years, four of the candidate methods have been tested and found workable…Yet there is one straightforward method that scholars have largely ignored, perhaps because it was thought to lack any hope of achieving the requisite accuracy. This is the ʽequinoctial solar gnomon methodʼ…”
”Occam’s Egyptian razor: the equinox and the alignment of the pyramids”, The Journal of Ancient Egyptian Architecture, JAEA 2, 2017, pp. 1-8, Glen Dash.
Dr. Troglodyte