Scientific+Advances

= = =Astronomy=

Various scientific advances were also contributions from the ordinary individuals in the Aztecs. An example is their interpretation of astronomy through their creation of two calendars, one which depicted the passage of time, the other created for religious purposes. "The Aztec calendar, the Xiuhpohualli was a solar calendar based on 365 days which consisted of eighteen months, each having 20 days and including five extra days that represented an unlucky period of time." ("Aztecs: Science") It is evident that throughout this time, the Aztecs were a group of individuals who were completely aware of the change of time and understood the movement of the Earth around the sun, something perceived before many others.

(Source: __ http://www.wikis.lib.ncsu.edu/index.php/Aztec_Astronomy __)