Aztec and Maya Calendar
In the tonalpohualli, the sacred Aztec calendar, Saturday April 12, 1947 is:
Xihuitl:
solar year
13 - Acatl (reed)
Xiuhpohualli:
365-day calendar
12 - Hueitecuilhuitl (VIII)
Long Count:
Mayan calendar
12.16.13.6.5
(Correlation: Alfonso Caso - Nicholson's veintena alignment [adjust])
The significance of this day
7-Coatl is the name day of Chicomecoatl, Corn Goddess, the female equivalent of Xochipili. A good day to start a trade expedition. A day for the ceremony for the Cihuateteo at the temple of Aticpac.
Day Coatl (Snake, known as Chicchan in Maya) 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-Quiahuitl (Rain) is ruled by Tlaloc, He Who Makes Things Sprout, god of rain, lightning and thunder. This trecena represents a time of alternating drought and flood. There is either not enough or too much. It is a time of hardship and suffering. The rainmaker stands alone atop the mountain, holding firesticks and a medicine bundle: help will be offered but may not be accepted. Some will have prepared for this time but not enough to care for everyone in need. These are good days to pursue solitude and learning; bad days to count on others.
Matt Damon was born on day 7-Coatl.
Aztec facts
In the years after the conquest of Mexico, the xiuhpohualli (solar calendar) became tied to the Julian calendar as used by the Spaniards. This effectively introduced a leap year to the Aztec calendar every four years (this site provides the pre-conquest calendar).