A note on the position and extent of the great temple enclosure of Tenochtitlan, and the position, structure and orientation of the Teocolli of Huitzilopochtli., has been acknowledged as a major work throughout human history, and we have taken precautions to assure its preservation by republishing this book in a modern manner for both present and future generations. This book has been completely retyped, revised, and reformatted. The text is readable and clear because these books are not created from scanned copies.