What I find to be a head scratcher; people come up with these esoteric concepts without explaining at all why the Egyptians were trying to prove the size of the planet, to what benefit were they engaged in such an enterprise? The Greeks you could say were prone to philosophical questions and perhaps would present such questions, who designed the Antikythera calculator? I have always squinted one eye when thinking about how just as Alexander conquered Egypt what followed was an immediate wealth of mathematics, astronomy and medicine attributed to the Greeks, are they imposters to this knowledge? we'll never know. However as mentioned above we have to ask to what end would knowing the circumference of the earth provide the Egyptians or the Greeks?

B.A.Hokom