During excavation Archaeologists discovered Woodhenge which "stood to the west of Monk's Mound." Woodhenge were "a circle of posts used to make astronomical sightings." These "placement of posts marked solstices and equinoxes, like its namesake, Stonehenge.89 Detailed analytical work supports the hypothesis that the placement of these posts was by design."

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According to Chappell, "A beaker11 found in a pit near the winter solstice post bore a circle and cross symbol that for many Native Americans symbolizes the Earth and the four cardinal directions. Radiating lines probably symbolized the sun, as they have in countless other civilizations."12 (Cahokia's Woodhenge is not to be confused with another site of the same name that exists in the United Kingdom).
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All of the above information quoted was obtain from http://en.wikipedia.org/wiki/Cahokia

Yes the mound builders where astronomical inclined they built several mounds which had Astronomical significance. The serpent Mound and the Alligator Effigy Mound were mounds built for such purposes.
Source(s):
http://en.wikipedia.org/wiki/Mound_builder_%28people%29

http://en.wikipedia.org/wiki/Serpent_Mound

http://www.absoluteastronomy.com/topics/Mound

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