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Thexiuhpōhualli (Nahuatl pronunciation:[ʃiʍpoːˈwalːi], fromxihuitl (“year”) +pōhualli (“count”)) is a 365-daycalendar used by the Aztecs and otherpre-ColumbianNahua peoples in central Mexico. It is composed of eighteen 20-day "months," which through Spanish usage came to be known asveintenas (“scores, groups of twenty”), with an inauspicious, separate 5-day period at the end of the year called thenēmontēmi. The name given to the 20-day periods in pre-Columbian times is unknown, and though theNahuatl word for moon or month,mētztli, is sometimes used today to describe them, the sixteenth-century missionary and ethnographer,Diego Durán explained that:
In ancient times the year was composed of eighteen months, and thus it was observed by these Indian 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.
Thexiuhpōhualli calendar (in history known as the "vague year" which means no leap day) had its antecedents in form and function in earlierMesoamerican calendars, and the 365-day count has a long history of use throughout the region. TheMaya civilization version of thexiuhpōhualli is known as thehaab', and 20-days period was theuinal. The Maya equivalent ofnemontemi iswayeb'. In common with other Mesoamerican cultures the Aztecs also used a separate260-day calendar (Classical Nahuatl:tonalpōhualli). The Maya equivalent of thetonalpōhualli is thetzolk'in. Together, these calendars would coincide once every 52 years, the so-called "calendar round," which was initiated by aNew Fire ceremony.
Aztec years were named for the last day of the 18th month according to the 260-day calendar thetonalpōhualli. The first year of the Aztec calendar round was called 2 Acatl and the last 1 Tochtli. The solar calendar is connected toagricultural practices and holds an important place inAztec religion, with each month being associated with its own particular religious and agricultural festivals.Each 20-day period starts on aCipactli (Crocodile) day of thetonalpōhualli for which a festival is held. The eighteenveintena are listed below. The dates in the chart are from the early eyewitnesses, Diego Durán andBernardino de Sahagún. Each wrote what they learned from Nahua informants. Sahagún's date precedes the Durán's observations by several decades and is believed to be more recent to the Aztec surrender to the Spanish. 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.
| # | Glyph | Name | Gregorian range | Presiding deities | |
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| Durán | Sahagún | ||||
| 1 |  | ātl cāhualo (“the water ceases”) cuahuitl ēhua (“the trees rise”) | Mar 01–Mar 20 | Feb 02–Feb 21 | Water gods |
| 2 |  | tlācaxīpēhualiztli (“flaying of men”) | Mar 21–Apr 09 | Feb 22–Mar 13 | Xipe Totec |
| 3 |  | tōzōztōntli (“lesser vigil”) | Apr 10–Apr 29 | Mar 14–Apr 02 | Tlaloc |
| 4 |  | huēyi tōzōztli (“greater vigil”) | Apr 30–May 19 | Apr 03–Apr 22 | Cinteotl |
| 5 |  | toxcatl (“dryness”) | May 20–Jun 08 | Apr 23–May 12 | Tezcatlipoca |
| 6 |  | etzalcualiztli (“eating of cooked maize and beans”) | Jun 09–Jun 28 | May 13–Jun 01 | Tlaloque |
| 7 |  | tēcuilhuitōntli (“lesser feast day”) | Jun 29–Jul 18 | Jun 02–Jun 21 | Huixtocihuatl |
| 8 |  | huēyi tēcuilhuitōntli (“greater feast day”) | Jul 19–Aug 07 | Jun 22–Jul 11 | Xilonen |
| 9 |  | tlaxōchimaco (“giving of flowers”) miccāilhuitōntli (“lesser feast day of the dead”) | Aug 08–Aug 27 | Jul 12–Jul 31 | Huitzilopochtli |
| 10 |  | xocotl huetzi (“the xocotl falls”) huēyi miccāilhuitl (“greater feast day of the dead”) | Aug 28–Sep 16 | Aug 01–Aug 20 | Xiuhtecuhtli |
| 11 |  | ochpaniztli (“sweeping”) | Sep 17–Oct 06 | Aug 21–Sep 09 | Teteo Innan |
| 12 |  | teōtlehco (“the gods arrive”) | Oct 07–Oct 26 | Sep 10–Sep 29 | All the gods |
| 13 |  | tepēilhuitl (“feast day of mountains”) | Oct 27–Nov 15 | Sep 30–Oct 19 | Mountains |
| 14 |  | quechōlli (“roseate spoonbill”) | Nov 16–Dec 05 | Oct 20–Nov 8 | Mixcoatl |
| 15 |  | panquetzaliztli (“raising of banners”) | Dec 06–Dec 25 | Nov 09–Nov 28 | Huitzilopochtli |
| 16 |  | ātemoztli (“descent of water”) | Dec 26–Jan 14 | Nov 29–Dec 18 | Rain gods |
| 17 |  | tititl (“tightening,” “contraction”) | Jan 15–Feb 03 | Dec 19–Jan 07 | Tonan |
| 18 |  | izcalli (“offshoot,” “bud”) | Feb 04–Feb 23 | Jan 08–Jan 27 | Xiuhtecuhtli |
| – |  | nēmontēmi (“they fill up in vain”)[1][2] | Feb 24–Feb 28 | Jan 28–Feb 01 | None |
Aztec years were named for the last day of their fourth month[3] according to the 260-day calendar, thetonalpohualli.
For many centuries, scholars have tried to reconstruct the Aztec calendar. A correlation that is accepted in some circles was proposed by professor Rafael Tena (INAH),[4] based on the studies of Sahagún, Durán and Alfonso Caso (UNAM). His correlation argues that the mexica year started onFebruary 13th using the oldJulian calendar orFebruary 23rd of the currentGregorian calendar.
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