Across the North American continent, indigenous peoples tracked the stars for a variety of reasons. This slide presentation reviews our knowledge of how Native Americans developed devices and techniques to track the movements of the sun, moon, and stars to develop calendars. William Iseminger will introduce audiences to these devices, with specific references to Cahokia's Woodhenge, mound alignments in Georgia, Louisiana, and Ohio, "medicine wheels" in the Great Plains, Pueblo structures in the Southwest, and similar structures in Mesoamerica.