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facts · 13 × 20
Two sequences move together
The number returns to one after thirteen; the sign returns to Cipactli after twenty. The original pairing returns only after 260 days.
| relative day | Tonalpohualli position | what changes |
|---|---|---|
| 0 | 1 Cipactli | both sequences advance |
| 1 | 2 Ehecatl | both sequences advance |
| 2 | 3 Calli | both sequences advance |
| 3 | 4 Cuetzpalin | both sequences advance |
| 4 | 5 Coatl | both sequences advance |
| 5 | 6 Miquiztli | both sequences advance |
| 6 | 7 Mazatl | both sequences advance |
| 7 | 8 Tochtli | both sequences advance |
| 8 | 9 Atl | both sequences advance |
| 9 | 10 Itzcuintli | both sequences advance |
| 10 | 11 Ozomahtli | both sequences advance |
| 11 | 12 Malinalli | both sequences advance |
| 12 | 13 Acatl | both sequences advance |
| 13 | 1 Ocelotl | number sequence restarts; sign sequence continues |
| 14 | 2 Cuauhtli | both sequences advance |
Relative day zero is not a historical date
The example defines day zero as 1 Cipactli solely to demonstrate the arithmetic. It does not claim a Gregorian epoch. Turning it into a birth-date result would require a separately selected and named correlation.