The code terms are presented in the Astronomic and Cosmographic indices linked hereabove. Using these abbreviations will facilitate this discussion. These two modules are here below illustrated. This discussion has hinted at why sites might be located where they are, first in discussing their alignments to other monuments within visible distances, then in pointing out their arc distance relationships in relation to the earth's circumference. In pointing out the latitude of the Fort Center circle the discussion has shifted to the properties of latitude.
Arc distance is constant except for the slight influence of plate tectonics.
Secular polar motion very slowly alters the latidude of almost all geodetic positions on the planet. The geodetic latitude where the tangent of the angular relationship to the equator equals 0.8000 is 38.65981 degrees. Given the formula for secular polar motion an approximate date for positioning of the monument exactly at the 0.8000 arc tangent latitude is deduced to be the year 1184. The date is almost precisely the radiocarbon date of the last constructs on the mound. In prehistoric time, without modern optics and theodolites, the task of computing latitude precisely would have been both a significant challenge and an impressive accomplishment.