A Mayan term which refers to epochs or periods of time, and also to regions or Heavens. The Thirteen Katuns are..
"..thirteen periods of time for each human race. Obviously, the prophecies for each one of the past Katuns of our Aryan Root Race were exactly fulfilled. Presently, we are approaching the Thirteenth Katun. The Mayas say that between the years 2040 and 2043, the Thirteenth Katun will enter into activity. The great catastrophe that will destroy this present humanity, which lives on the five continents of the world, will occur during the Thirteenth Katun...
"Ain, Ain Soph, Ain Soph Aur.
"Kether, Chokmah, Binah, Chesed, Geburah, Tiphereth, Netzach, Hod, Yesod, Malkuth.
"These are the thirteen Aeons or supra-sensible atomic Regions, which are mutually penetrating and co-penetrating without confusion. The Unmanifested Absolute is beyond these thirteen Aeons." - Samael Aun Weor, The Pistis Sophia Unveiled