Huaca del Sol
"Measuring at least 342 m by more than 159 m, Huaca del Sol was the largest brick structure in South America. … Colonial period looters used the Moche river to wash away at least two thirds of the mound…."
The Adobes of Huaca del Sol and Huaca de la Luna
C. Mansfield Hastings and M. Edward Moseley
American Antiquity 40(2) 1975
Ancient Monument Placemarks
http://www.jqjacobs.net/archaeo/sites/index.html

atan(1/7) baseline
atan(1/7) South latitude
-8.13010 latitude

hdsol

Outline of Huaca del Sol
Outline after Hastings and Moseley
hdsol
-8.130968
-78.994998
"The latitude with arctangent equaling one-seventh (atan 1/7 = 8.13010 degrees) crosses Huaca del Sol, in the Moche Valley. "
Chankillo, Peru, Ancient Solar Observatory?
http://jqjacobs.net/peru/chankillo.html

Plan of Huaca del Sol
Figure credit: Hastings and Moseley 1975, American Antiquity 40(2):169

ncec - hdsol
Great Circle - Huaca del Sol
arc = 1.80 S22
arc = 48.27668 degrees
nocc - hdsol : ncec - hdsol = 1.0 : 1.0002501

Huaca del Sol centerline

hdscl
Huaca del Sol centerline
-8.131318
40