Aztec and Maya Calendar
In the tonalpohualli, the sacred Aztec calendar, Friday April 28, 1950 is:
Xihuitl:
solar year
3 - Tochtli (rabbit)
Xiuhpohualli:
365-day calendar
9 - Tlaxochimaco (IX)
Long Count:
Mayan calendar
12.16.16.7.17
(Correlation: Alfonso Caso - Nicholson's veintena alignment [adjust])
The significance of this day
Day Ollin (Movement, known as Caban in Maya) is governed by Xolotl as its provider of tonalli (Shadow Soul) life energy. This is an auspicious day for the active principle, a bad day for the passive principle. Ollin is a day of the purified heart, signifying those moments where human beings may perceive what they are becoming. A good day for transmutation, which arrives like an earthquake that leaves in its wake the ruins of rationality, order and the preconceived.
The thirteen day period (trecena) that starts with day 1-Ollin (Movement) is ruled by Tlazolteotl. This trecena is governed by the goddess of cotton and weaving, of sexuality and childbirth, she who is the eater of sins: it is the sign of the Scavenger, who feeds not on power but on the ills that darken the heart. The rainbow serpent, symbol of pleasure and folly, levitates amidst a shroud of smoke and shadow: these are 13 days of stolen secrets and odd twists of fate. The earth itself shakes: the ills created by shock can sometimes only be cured by greater shock. These are good days for self-purification; bad days for self-gratification.
Ronaldinho was born on day 1-Ollin.
Aztec facts
The Aztecs did not use a leap year correction but they knew the length of a solar year is neither 365 nor 365.25 days. Presumably they kept some count of days to register astronomical events but no evidence of an Aztec Long Count exists.