Much proof was forthcoming during the latter part of the last century for ancient navigation across both the Atlantic and Pacific ocean to the Americas by the stellar work correlating writing and pottery styles conducted by scholars such as Betty Meggers, Ivan Van Sertima, Barry Fell, and more recently Michael Xu, the mystery to them how the navigation across the Atlantic and Pacific was achieved, but now we know it was by mapping according to the precession rate of the earth’s axis, the means for geometry, earth measure (see Page at right Great Pyramid for Navigation).