 I don't know, but they couldn't do anything like a metric system until they could figure out how much is 110th millionth distance from the North Pole to the equator. Well, and after you said that, that's what got me to thinking, well, is that what the Mayans and the Egyptians used to make the pyramids and their temples? I have no idea what they used, but they were pretty exact, whatever it was.