Mayan Calendar

The Mayans had a civil calendar or Haab that used 18 months of 20 days with a 5-day period at the end of each year, called Uayeb. The South American culture also had a divinatory calendar or Tzolkin, which had days numbered 1 to 13 and also named days in a cycle of 20 names. The sequence started over every 260 days and synchronized with the Haab every 52 Haab years, a time at which the Mayans believed the world might end. The master Mayan calendar, which purportedly counts down from the beginning of the world, is set to finally reach zero in December 2012.