Aztec and Maya Calendar
In the tonalpohualli, the sacred Aztec calendar, Sunday April 21, 2013 is:
(1 -) Ocelotl (jaguar)
1 - Calli (house)
Lord of the Night
18 - Tlaxochimaco (IX)
(Correlation: Alfonso Caso - Nicholson's veintena alignment [adjust])
The significance of this day
Day Cipactli (Crocodile) is governed by Tonacatecuhtli, Lord of Nurturance, as its provider of tonalli (Shadow Soul) life energy. Cipactli is an auspicious day, signifying advancement and honor. It depicts energy and work, rewards and recognition. A good day for beginnings.
The thirteen day period (trecena) that starts with day 1-Ocelotl (Jaguar) is ruled by Quetzalcoatl. This trecena represents brilliance and clarity during a profound eclipse of the light. The principal influence of this time is the divine Whirlwind: to stand in its path calls down destruction; to stand in its eye calls down creation. These are good days to withdraw into the solitude of contemplation and self-discipline; bad days to traffic with those on another path. In the center of it all, the warrior strives to be the mirror rather than the reflection.
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).