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Dual Calendar System, with incredible precision, due to expertise in astronomy

The central figure is shown holding a human heart in each of his clawed hands, and his tongue is represented by a stone sacrificial knife.

Consists of three separate corresponding calendars, the Long Count, the Tzolkin (divine calendar), and the Haab (civil calendar).

Time is cyclical in the calendars and a set number of days must occur before a new cycle can begin.

The Long Count is an astronomical calendar which was used to track longer periods of time. The Long-count has a start date of 3,113 BC.

The Tzolkin is a 260-day calendar, with 20 periods of 13 days used to determine the time of religious and ceremonial events. This calendar also correlates to pregnancy.

The Haab is a 365 day solar calendar which is divided into 18 months of 20 days each and one month which is only 5 days long (Uayeb).

The calendar has an outer ring of Mayan glyphs which represent each of the 19 months.

Each day is represented by a number in the month followed by the name of the month. Each glyph represents a personality associated with the month.

The last day of the Mayan calendar corresponds with the Winter Solstice, which plays a significant role in many cultures (Links to an external site.) all over the world.

The Mayans didn't invent the calendar, it was used by most cultures in pre-Columbian Central America - including the Mayans - from around 2000 BC to the 16th century. The Mayan civilization developed the calendar further and it's still in use in some Mayan communities today.

One of the cycles in the Mayan calendar came to an end on December 21, 2012. This caused many to believe that the world was coming to an end. In the run-up to the day, the internet abounded with predictions about an apocalypse happening on "12/21/12".