A publication of the Archaeological Institute of America
Primer: Three Maya Calendars
By ZACH ZORICH
Friday, November 30, 2012
Glyphs on the back of a monument from the site of Tonina in Mexico spell out a date that is the last known use of the Long Count calendar. The carving at the top of the monument is an introductory glyph that has not yet been translated. The rest of the glyphs record the Long Count calendar date—10 bak'tun, 4 k'atun, 0 tun, 0 winal. Because the monument was broken, the bottom glyph in the date is obscured, but it probably reads 0 k'in. The date corresponds to January 20, A.D. 909. The Maya calendar that records the longest span of time is called the Long Count. It marks the number of days that have passed since a mythological founding date that fell on either August 11 or 13, 3114 B.C., depending on how the Maya calendar is reconciled with our calendar. Long Count dates are usually written as a series of five numbers, such as 126.96.36.199.3 (the date that corresponds to January 1, A.D. 1). The smallest unit of time is the day, or k’in, and it is recorded in the place farthest to the right. The next place records the number of winals, a 20-day unit of time often referred to as a “Maya month.” The third place records the number of Maya years called tuns. Eighteen winals make up a tun, for a total of 360 days. The Maya extended the count by multiplying each successive cycle by 20. Thus, 20 tuns make up a k’atun, and 20 k’atuns make up a bak’tun—a period of time equivalent to 394.52 solar years.
Maya monuments that have Long Count dates often include dates from other types of calendars. The two most important of these time cycles are the tzolk’in, a 260-day cycle that may be based on the duration of a human pregnancy, and the haab, a calendar that approximates the solar year. One example of an artifact that includes dates from all three calendars is monument six from the site of Tortuguero. An inscription on that monument mentions the date at the end of the thirteenth bak’tun, which falls on December 23, 2012, written as 188.8.131.52.0 4 Ajaw 3 K’ank’in by the ancient Maya.
Only two Maya monuments refer to the end of the 13th bak'tun, which will occur on December 21 (or 23) this year. Part of the controversy over what will happen on that day stems from the inscription on monument six from the site of Tortuguero in Mexico. A glyph in the far right column refers to the end of the 13th bak'tun in the Long Count calendar. Another glyph states that the day will fall on 4 Ajaw in the tzolk'in calendar, and a third glyph states the day will fall on 3 K'ank'in in the haab calendar. According to epigrapher Barbara MacLeod, the glyphs following the dates make a cryptic reference to a deity named B'olon Yokte' ascending to power on that day. This inscription has fueled some of the apocalyptic predictions involving the end of the 13th bak'tun.
The date 4 Ajaw records the day in the tzolk’in calendar. The tzolk’in is based on a 13-day “week.” The number 4 in the date records the day of the week. There are also 20 named days, so each day has a name and a number. The first named day is Imix, which translates as “water serpent” in Yukatek Mayan, followed by Ik’ (“wind”), and Ak’bal (“night”). The numbers run concurrently with the names, so the first day of the tzolk’in calendar is 1 Imix, followed by 2 Ik’, and then 3 Ak’bal. After day 13 is reached, the numbers start over but the names continue, therefore the fourteenth day of the tzolk’in is called 1 Ix (“jaguar”). This cycle continues for 260 days, when the calendar returns to 1 Imix. The twentieth day name, and the one mentioned in the Tortuguero monument, is Ajaw (“lord”), which was the day when many important festivals commemorating period endings were celebrated.
The date “3 K’ank’in” refers to a day in the haab calendar, which is based on the solar year. Each day in the haab is numbered from zero to 19 and occurs during one of 18 named months called a winal. The first day of the haab is called 0 Pop, the second day is 1 Pop, etc., up to 19 Pop. The twenty-first day of the haab is 0 Wo. The 18 winals add up to 360 days. The remaining five days of the solar year were called Wayeb, and were considered a time of bad luck. The Maya did not include a leap day in the haab calendar, so it would diverge from our modern calendars by one day every four years.
The tzolk’in and haab calendars were also used together in what is called the “Calendar Round.” Starting at 1 Imix 0 Pop, it takes 52 haab years or 73 tzolk’in cycles for the two calendars to come around again to that date. The last calendar round was completed on April 28, 2011. The next one will end on April 15, 2063.
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