Chankillo: A 2300-Year-Old Solar Observatory in Coastal Peru

{'id': 'ghezzi2007', 'abstract': ' The Thirteen Towers of Chankillo run north to south along a low ridge within a fourth-century B.C.E. ceremonial complex in north coastal Peru. From evident observing points within the adjacent buildings to the west and east, they formed an artificial toothed horizon that spanned—almost exactly—the annual rising and setting arcs of the Sun. The Chankillo towers…