Chankillo

Un-named culture, from 2500 B.C.E. to 200 B.C.E.; located in the Casma-Sechin Oasis in the Ancash Department of Peru, across the Casma River from Moxeke. This is the oldest-known solar calendar/observatory in the Americas.

Elevation is c. 300 meters (983 feet) above sea level.

Materials: cut stone.

Data for CG model:
1. Malville, J. McKim, 2014. THE CASMA VALLEY OF PERU: A CRADLE OF PRE-INCA ASTRONOMY, University of the Aegean, 2014, Mediterranean Archaeology & Archaeometry, 14, 3 (2014) 169-178.
( http://maajournal.com/Issues/2014/Vol14-3/Full16.pdf ).
2. Sparavigna, Amelia Carolina, 2012. The solar towers of Chankillo
Department of Applied Science and Technology Politecnico di Torino, C.so Duca degli Abruzzi 24, Torino, Italy.
( https://arxiv.org/pdf/1208.3580.pdf ).
3. https://www.wmf.org/project/chankillo
4. https://www.google.com/search?biw=1276&bih=1484&tbm=isch&sa=1&ei=sz-5WsSLMoKYjwPEt5aYDA&q=Chankillo+Casma-Seshin+Peru+plan&oq=Chankillo+Casma-Seshin+Peru+plan&gs_l=psy-ab.12...111648.111648.0.113456.1.1.0.0.0.0.94.94.1.1.0....0...1c.2.64.psy-ab..0.0.0....0.SMzPRwWKH4s