The set of day signs used in central Mexico is identical to that used by Mixtecs, and to a lesser degree similar to those of other Mesoamerican calendars. Where the Aztec differed most significantly from the Maya was in their more primitive number system and in their less precise way of recording dates. The xiuhpohualli was the 'counting of the years.' This calendar was kept on a 365-day solar count.
The solar year was the basis for the civil calendar by which the Mexicas (Aztecs) determined the myriad ceremonies and rituals linked to agricultural cycles.

Many of the Aztecs' religious ceremonies, including frequent human sacrifices, were performed at the Great Temple, located in the center of their capital city of Tenochtitlan.
It is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout ancient Mesoamerica. This ritual calendar was registered in the tonalamatl (book of days), a green-fold bark paper or deerskin codex from which a priest (called tonalpouque) cast horoscopes and predicated favorable and unfavorable days of the cycle. The xiuhpohualli is considered to be the agricultural calendar, since it is based on the sun, and the tonalpohualli is considered to be the sacred calendar.
The four epochs represented inside the square portions of this symbol correspond to the four previous epochs also called suns.
The Codex Magliabechiano is a pictorial Aztec codex created during the mid-16th century, in the early Spanish colonial period.
The Aztecs believed that they were in the fifth sun and like all of the suns before them they would also eventually perish due to their own imperfections.

The Aztec word for moon is metzli but whatever name that was used for these periods is unknown. The Mayan calendar has a similar configuration and the same 20-days period which they labeled uinal. Through Spanish usage, the 20 day period of the Aztec calendar has become commonly known as a veintena.
Priests used the calendar to determine luck days for such activities as sowing crops, building houses, and going to war.

Free online photo effects for couples Tattoo designer online free Photo image editor download |