As the guards continued their patrol in a westerly direction along the northern face of the Great Pyramid, we made our way around the north-eastern corner and along the base of the eastern face. I had long ago fallen into the habit of orienting myself according to the monument’s sides. The northern face was aligned, almost perfectly, to true north, the eastern face almost perfectly to true east, the southern to true south, and the western face to true west. The average error was only around three minutes of arc (down to less than two minutes on the southern face)1 – incredible accuracy for any
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