A discussion of some aspects of Mesoamerican astronomy including the Mayan calendar with its Calendar Round and Long Count Calendar and the cities of Chichen Itza, Palenque, Teotihuacan and Tenochtitlan.
The Exploratorium's Page on the Caracol at Chichen Itza (Highly Recommended)
El Castillo-Chichen Itza
Temple of the Inscriptions-Palenque
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