History & development
The Mexica tonalpohualli belongs to the wider Mesoamerican family of 260-day ritual counts. Scholarship on pictorial manuscripts shows calendrical divination embedded in religious and historical contexts. Its numerical resemblance to a Maya count does not establish identical correlations, names or interpretations.
Mythology & symbolic world
Central Mexican daybooks combine day signs with divine figures and other imagery. Jansen and Perez Jimenez discuss such manuscripts as organized religious knowledge. Reading one requires its visual sequence and cultural setting, rather than a modern zodiac-style list alone.
Provenance: where the rules come from
Stellarium documents one computational implementation of the thirteen-number and twenty-name structure. This registry has not adopted a correlation and validated a personal tonalpohualli result.
How it is calculated
Choices that change the result: Do not rename a Maya result as an Aztec one.
Inspect your calculated data →Uses & use cases
- Compare the structures of related Mesoamerican counts.
- Study how a pictorial daybook organizes ritual time.
Interpretation methods
Work from a named calendar and codex
Choose the historical or living tradition and a documented correlation; calculate the numerical label, then consult the relevant manuscript sequence and its scholarship.
Renaming a Maya day sign with a similar Nahuatl word does not establish a valid Mexica date conversion. Each count needs its own documented correlation and naming convention.
Concepts in this tradition
Follow a term for its definition, word origin, evidence and connected ideas.
Disagreements & limits
- Similar cycle lengths do not prove identical epochs.
- The Sun Stone is not a universal decoder for all Mesoamerican calendars.
- No personal Aztec reading is emitted; cultural names and correlation evidence remain necessary.
Sources & evidence
Practitioner sources describe their own systems. Historical and astronomical sources support different kinds of claims. Reading exercises are editorial teaching examples.
- The Mat and the Throne — Maarten Jansen and Gabina Aurora Perez Jimenez ↗scholarly study of Mesoamerican manuscripts
- AztecTonalpohualliCalendar — Stellarium ↗original implementation documentation