<i>”The distance around Mount Castro along this path is less than 2,200 meters (275 bow lengths), so an error of two millimeters per bow length could give a total leveling error ofabout 55 centimeters.”</i><p>I don’t see a reason to assume any correlation between errors, so one would expect about sqrt(275) or 17-ish times 2 millimeters of total errors, or a few centimeters.<p>On the one hand, that makes it easier to use such a construct. On the other hand, I suspect the ‘2 mm’ figure was at least partially made up to fit the data.<p>Also, I find it weird that the text doesn’t mention any attempts to locate the various stone pillars presumably constructed. Surely, some remains should still be there?