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Cahokia was a major Native American city on the east side of the Mississippi River, across from the modern-day city of St. Louis, Missouri. Cahokia flourished from c.1050 AD to c.1250. In this paper archaeoastronomic and ethnohistoric data along with computer simulations are used to explore the idea that the Cahokia site axis and the Rattlesnake Causeway were intentionally aligned to the Milky Way. It is proposed that this alignment accounts for the peculiar 5° offset of the site from the cardinal directions. Following Sarah Baires, it is suggested that Rattlesnake Causeway was a terrestrial metaphor for the Milky Way Path of Souls used by the deceased to cross to the Land of the Dead. Rattlesnake Mound at the end of the Causeway is suggested as a portal to the Path of Souls. According to ethnohistoric accounts, the Land of the Dead was guarded by a Great Serpent – suggested here as visible in the night sky as either the constellation Serpens or that of Scorpius.

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Google Earth Pro (GEP) is a powerful tool that can be used for archaeoastronomic and landscape archaeology assessments. Of potential concern, however, is the accuracy of the GEP ruler tool and, in particular, the accuracy of heading information. In the present paper the accuracy of GEP heading information is evaluated. Comparative assessments are made using GEP imagery, airport runway diagrams and ground survey data derived from total station solar observations. These analyses indicate that the accuracy of GEP heading data is largely dependent on spatial resolution of the GEP image and length of the line being measured.