Did you know that the Cahokia Woodhenge, built by the Native American Mississippian culture between 900 and 1100 CE, was a timber circle solar calendar used to observe solstices and equinoxes? 
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Did you know that the Cahokia Woodhenge, built by the Native American Mississippian culture between 900 and 1100 CE, was a timber circle solar calendar used to observe solstices and equinoxes? 
