What are the origins of the 13 Moon calendar in Mayan culture?
The Thirteen Moon calendar was originally known by the Maya as the Tun Uc, the “moon count” or “count of seven” (7 x 4 = 28). The correlation date on the Gregorian calendar, July 26, is also derived from the prophetic tradition of the Chilam Balam or Jaguar Priests. This date on the Julian calendar was July 16, and was first correlated with the heliacal rising of Sirius at 19.5 latitude north in the Mayan temple site of Edzna in AD 692. This also corresponds to the dedication date of the tomb of Pacal Votan in Palenque , Chiapas , Mexico , whose prophecy, Telektonon, espouses the return to natural time through following the Thirteen Moon calendar.
