Aztec and Maya Calendar
In the tonalpohualli, the sacred Aztec calendar, Tuesday August 13, 1521 is:
(1 -) Coatl (snake)
3 - Calli (house)
Lord of the Night
2 - Xocolhuetzi (X)
(Correlation: Alfonso Caso - Nicholson's veintena alignment [adjust])
The significance of this day
1-Coatl is a good day to start a trade expedition.
Day Coatl (Snake) is governed by Chalchihuitlicue as its provider of tonalli (Shadow Soul) life energy. Coatl is the day of the snaking river that always changes without changing. It signifies the fleeting moment of eternal water. A good day for humility, a bad day for acting on self-interests.
The thirteen day period (trecena) that starts with day 1-Coatl (Snake) is ruled by Xiuhtecuhtli, Lord of the Year, the ancient god of fire who stands at the center. The 13 days of this trecena are governed by the forces that have created a power vacuum in the situation. The throne is empty and the rightful heir must struggle with all the pretenders who would claim it. These are 13 days of conflict, intrigues and unexpected developments. The throne will fall to the one who has laid the groundwork, built the alliances and is favored by the timing of events beyond any one person's control. This time will come again: those who are not prepared should bide their time; those who hold the throne should beware. These are good days to act out of strength, bad days to rely on the strength of others.
Sarah Jessica Parker was born on day 1-Coatl.
The Aztec, Maya and most other mesoamerican people used the same 260-day calendar with an identical correlation. So the Aztec date 1-Cipactli corresponds to 1-Imix for the Maya, etcetera.