Zodiac and Roman Army Camp construction

[Macedon]

In defense of Steven in that "theorema" question, I would add that a "theorema" could be a mathematical theorem and thus roughly translated as a mathematical formula. I do not think that this is the biggest issue, Duncan, although I also would like to see more references to the original texts. I only can guess that Steven wants to keep things intentionally misty so as not to reveal the content of his book.