The Haab' is part of the Maya calendric system used by peoples of the pre-Columbian Maya civilization. It was the Maya version of the 365-day calendar known to many of the pre-Columbian cultures of Mesoamerica, which approximated the solar year.


The Haab' comprises eighteen "months" of twenty days each, plus an additional period of five days ("nameless days") at the end of the year known as "Wayeb"' (or "Uayeb" in 16th C. orthography).

Bricker (1982) estimates that the Haab' was first used around 550 BCE with the starting point of the December winter solstice. The Haab' was the foundation of the agrarian calendar and the month names are based on the seasons and agricultural events. For example the thirteenth month, Mak, may refer to the end of the rainy season and the fourteenth month, K'ank'in, may refer to ripe crops in the fall.Fact|date=February 2007

The Haab' month names are most commonly referred to by their names in colonial-era Yucatec (Yukatek). In sequence, these (in the revised orthography [Again, per Kettunen and Helmke (2005)] ) are as seen on the right:Each day in the Haab' calendar was identified by a day number within the month followed by the name of the month. Day numbers began with a glyph translated as the "seating of" a named month, which is usually regarded as day 0 of that month, although a minority treat it as day 20 of the month preceding the named month. In the latter case, the seating of Pop is day 5 of Wayeb'. For the majority, the first day of the year was 0 Pop (the seating of Pop). This was followed by 1 Pop, 2 Pop ... 19 Pop, 0 Wo, 1 Wo and so on.

Inscriptions on The Temple of the Cross at Palenque shows clearly that the Maya were aware of the true length of the year, even though they did not employ the use of leap days in their system of calculations generally. J. Eric Thompson [p.121, J. Eric Thompson, Maya Hieroglyphic Writing. University of Oklahoma Press. (1971) ISBN 0-8061-0958 ] wrote that the Maya knew of the drift between the Haab and the solar year and that they made "calculations as to the rate at which the error accumulated, but these were merely noted as corrections they were not used to change the calendar."

There are at least two inscriptions with periods of 1508 Haab from Palenque [http://www.jqjacobs.net/mesoamerica/meso_astro.html Mesoamerican Archaeoastronomy by James Q. Jacobs ] ] which equates to 1507 tropical years, or 550420 days. This gives the Maya approximation to the tropical year at being 365.2422 days, being more accurate than the Gregorian Year currently used across the world today. 1508 Haab also incorporates 29 full Calendar Rounds, and two codices, the Codex Laud and Codex Mexicanus also records the 1508 Haab intervals.


The five nameless days at the end of the calendar called Wayeb' were thought to be a dangerous time. Foster (2002) writes "During Wayeb, portals between the mortal realm and the Underworld dissolved. No boundaries prevented the ill-intending deities from causing disasters." To ward off these evil spirits, the Maya had customs and rituals they practiced during Wayeb'. For example, people avoided leaving their houses or washing or combing their hair.

ee also

* Tzolk'in
* Calendar round



* | year=1982| title=The Origin of the Maya Solar Calendar| journal=Current Anthropology| volume=23| issue=1|pages=pp.101–103| doi=10.1086/202782
* |authorlink=Michael D. Coe |year= 1992| title= Breaking the Maya Code| location = London | publisher=Thames and Hudson|id=ISBN 0-500-05061-9
* |year=2002| title=Handbook to Life in the Ancient Mayan World| location=New York | publisher=Facts on File
* |authorlink=Harri Kettunen |coauthors=and aut|Christophe Helmke | year=2005 | title=Introduction to Maya Hieroglyphs: 10th European Maya Conference Workshop Handbook |url= http://www.mesoweb.com/resources/handbook/ |format=pdf |accessdate=2006-06-08 | location=Leiden | publisher=Wayeb and Leiden University

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