http://www.associatedcontent.com/article/2478386/2012_maya_aztec_calendar_milankovitch.html

2012 Milankovitch Cycles & Global Warming

The slow precession of the earth's wobble is called the Great, Cosmic or Platonic year and equals 25,860 earth's years. In ancient Maya mythology, the Cosmic Millstone is the sun's path, across the galactic equator and the ecliptic marking 13.0.0.0.0