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Unformatted text preview: -Venus was very important-Marked zenial passages-Mayan mathematics o Base 20 system o Invented the concept of zero Anasazi (ca. AD 1000)-Lived in 4 corners area of SW USA-Built structures to mark solstices and equinoxes. Plains tribes of North America Star maps and sighting circles were drawn on the ground to mark solstice rising points of sun and helical rising points of stars. Purpose to do so:-To keep time-For agricultural purposes-For religious purposes As far as we can tell, none of these ancient cultures tried to build a physical model based on their observations. Instead, they created myths to explain the motions of the objects in the sky....
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- Winter '08