The Aztec or Mexica calendar is the calendar system that was used by the Aztecs as well as other Pre-Columbian peoples of central Mexico. It is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout ancient Mesoamerica.
The calendar consisted of a 365-day calendar cycle called xiuhpohualli (year count) and a 260-day ritual cycle called tonalpohualli (day count). These two cycles together formed a 52-year "century," sometimes called the "calendar round". The xiuhpohualli is considered to be the agricultural calendar, since it is based on the sun, and the tonalpohualli is considered to be the sacred calendar.
The tonalpohualli ("day count") consists of a cycle of 260 days, each day signified by a combination of a number from 1 to 13, and one of the twenty day signs. With each new day, both the number and day sign would be incremented: 1 Crocodile is followed by 2 Wind, 3 House, 4 Lizard, and so forth up to 13 Reed, after which the cycle of numbers would restart (though the twenty day signs had not yet been exhausted) resulting in 1 Jaguar, 2 Eagle, and so on, as the days immediately following 13 Reed. This cycle of number and day signs would continue similarly until the 20th week, which would start on 1 Rabbit, and end on 13 Flower. It would take a full 260 days (13×20) for the two cycles (of twenty day signs, and thirteen numbers) to realign and repeat the sequence back on 1 Crocodile.
The set of day signs used in central Mexico is identical to that used by Mixtecs, and to a lesser degree similar to those of other Mesoamerican calendars. Each of the day signs also bears an association with one of the four cardinal directions.
There is some variation in the way the day signs were drawn or carved. Those here were taken from the Codex Magliabechiano.
Other marks on the stone showed the current world and also the worlds before this one. Each world was called a sun, and each sun had its own species of inhabitants. The Aztecs believed that they were in the fifth sun and like all of the suns before them they would also eventually perish due to their own imperfections. Every fifty two years was marked out because they believed that fifty two years was a life cycle and at the end of any given life cycle the gods could take away all that they have and destroy the world.
The 260 days of the sacred calendar were grouped into twenty periods of thirteen days each. Scholars usually refer to these thirteen-day "weeks" as trecenas, using a Spanish term derived from trece "thirteen" (just as the Spanish term docena "dozen" is derived from doce "twelve"). The original Nahuatl term is not known.
Each trecena is named according to the calendar date of the first day of the thirteen days in that trecena. In addition, each of the twenty trecenas in the 260-day cycle had its own tutelary deity:
|1 Crocodile||Ometeotl||1 Monkey||Patecatl|
|1 Jaguar||Quetzalcoatl||1 Lizard||Itztlacoliuhqui|
|1 Deer||Tepeyollotl||1 Quake||Tlazolteotl|
|1 Flower||Huehuecoyotl||1 Dog||Xipe Totec|
|1 Reed||Chalchiuhtlicue||1 House||Itzpapalotl|
|1 Death||Tonatiuh||1 Vulture||Xolotl|
|1 Rain||Tlaloc||1 Water||Chalchiuhtotolin|
|1 Grass||Mayahuel||1 Wind||Chantico|
|1 Snake||Xiuhtecuhtli||1 Eagle||Xochiquetzal|
|1 Flint||Mictlantecuhtli||1 Rabbit||Xiuhtecuhtli|
"In ancient times the year was composed of eighteen months, and thus it was observed by the native people. Since their months were made of no more than twenty days, these were all the days contained in a month, because they were not guided by the moon but by the days; therefore, the year had eighteen months. The days of the year were counted twenty by twenty." - Diego Durán
Xiuhpohualli is the Aztec year (xihuitl) count (pohualli). One year consists of 360 named days and 5 nameless (nemontemi). These 'extra' days are thought to be unlucky. The year was broken into 18 periods of twenty days each, sometimes compared to the Julian month. The Aztec word for moon is metztli but whatever name was used for these periods is unknown. Through Spanish usage, the 20-day period of the Aztec calendar has become commonly known as a veintena.
Each 20-day period started on Cipactli (Crocodile) for which a festival was held. The eighteen veintena are listed below. The dates are from early eyewitnesses. Each wrote what they saw. Bernardino de Sahagún's date precedes the observations of Diego Durán by several decades and is believed to be more recent to the surrender. Both are shown to emphasize the fact that the beginning of the Native new year became non-uniform as a result of an absence of the unifying force of Tenochtitlan after the Mexica defeat.
|#||Duran Time||Sahagun Time||Fiesta Names||Symbol||English Translation|
|1||MAR 01 - MAR 20||FEB 02 - FEB 21||Atlcahualo, Cuauhitlehua||Ceasing of Water, Rising Trees|
|2||MAR 21 - APR 09||FEB 22 - MAR 13||Tlacaxipehualiztli||Rites of Fertility; Xipe-Totec ("the flayed one")|
|3||APR 10 - APR 29||MAR 14 - APR 02||Tozoztontli||Lesser Perforation|
|4||APR 30 - MAY 19||APR 03 - APR 22||Huey Tozoztli||Greater Perforation|
|5||MAY 20 - JUN 08||APR 23 - MAY 12||Toxcatl||Dryness|
|6||JUN 09 - JUN 28||MAY 13 - JUN 01||Etzalcualiztli||Eating Maize and Beans|
|7||JUN 29 - JULY 18||JUN 02 - JUN 21||Tecuilhuitontli||Lesser Feast for the Revered Ones|
|8||JULY 19 - AUG 07||JUN 22 - JUL 11||Huey Tecuilhuitl||Greater Feast for the Revered Ones|
|9||AUG 08 - AUG 27||JUL 12 - JUL 31||Tlaxochimaco, Miccailhuitontli||Bestowal or Birth of Flowers, Feast to the Revered Deceased|
|10||AUG 28 - SEP 16||AUG01 - AUG 20||Xócotl huetzi, Huey Miccailhuitl||Feast to the Greatly Revered Deceased|
|11||SEPT 17 - OCT 06||AUG 21 - SEPT 09||Ochpaniztli||Sweeping and Cleaning|
|12||OCT 07 - OCT 26||SEPT10 - SEPT 29||Teotleco||Return of the Gods|
|13||OCT 27 - NOV 15||SEPT 30 - OCT 19||Tepeilhuitl||Feast for the Mountains|
|14||NOV 16 - DEC 05||OCT 20 - NOV 8||Quecholli||Precious Feather|
|15||DEC 06 - DEC 25||NOV 09 - NOV 28||Panquetzaliztli||Raising the Banners|
|16||DEC 26 - JAN 14||NOV 29 - DEC 18||Atemoztli||Descent of the Water|
|17||JAN 15 - FEB 03||DEC 19 - JAN 07||Tititl||Stretching for Growth|
|18||FEB 04 - FEB 23||JAN 08 - JAN 27||Izcalli||Encouragement for the Land & People|
|18u||FEB 24 - FEB 28||JAN 28 - FEB 01||nemontemi (5 day period)||Empty days (no specific activities or holidays)|
For many centuries scholars had tried to reconstruct the Calendar. The latest and more accepted version was proposed by professor Rafael Tena (INAH), based on the studies of Sahagún and Alfonso Caso (UNAM). His correlation confirms that the first day of the mexica year was February 13 of the old Julian calendar or February 23 of the current Gregorian calendar. Using the same count, it has been verified the date of the birth of Huitzilopochtli, the end of the year and a cycle or "Tie of the Years," and the New Fire Ceremony, day-sign "1 Tecpatl" of the year "2 Acatl," corresponding to the date February 22nd.
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