@inti I call this Pueblo Colorado Circle. Are #geoglyph or #intaglio better?
Another #GreatCircle on #PachaMama. Outlines in my graphic are relative sizes.
#Stonehenge fits inside the tiny circle beside #NewarkOctagon.
Octagon Earthworks - http://www.jqjacobs.net/archaeo/octagon.html
Results are center-on-center ratios, margins of error less than 4m.
#PovertyPoint #KML, #GoogleEarth file: http://jqjacobs.net/kml/poverty_point.kml
#archaeology #geodesy #mathematics #earthworks #NewMexico #Ohio #Bolivia