The Americas in the medieval world (500 – 1500). A thousand years of kingdoms, caliphates, steppe empires and trading cities between the fall of Rome and the voyages that joined the hemispheres.
The Classic Maya put the Venus cycle at 584 days, against NASA's 583.92, and set its returns in the Dresden Codex Venus Table from generations of naked-eye records.
· AD 900Ancestral Pueblo people carried about 240,000 beams 75 km into Chaco Canyon from 850 to 1130, then moved on in a drought; 19 Pueblos and the Hopi claim it.
· 1050Monks Mound, 291 by 236 meters at one contour, anchored Cahokia in Illinois, a city of about 120 mounds and nearly 20,000 people about 1100, empty by 1350.
· 1100
