Tonalpohualli

Tonalpohualli ("counting of days" in Nahuatl) is the sacred 260-day calendar of Mesoamerican civilization.

Structure. 20 day signs (tonalli) rotate simultaneously with 13 numbers, producing 260 unique combinations. Each combination defines:

• The character of a day
• The destiny of a person born on it
• The corresponding ritual prescriptions

The Mayan parallel. The parallel system is the Tzolkin, which shares the same mathematical structure but uses different sign names.

The 20 Day Signs

Cipactli (Crocodile), Ehecatl (Wind), Calli (House), Cuetzpalin (Lizard), Coatl (Serpent), Miquiztli (Death), Mazatl (Deer), Tochtli (Rabbit), Atl (Water), Itzcuintli (Dog), Ozomatli (Monkey), Malinalli (Grass), Acatl (Reed), Ocelotl (Jaguar), Cuauhtli (Eagle), Cozcacuauhtli (Vulture), Ollin (Movement), Tecpatl (Flint), Quiahuitl (Rain), Xochitl (Flower).

Sign connections. Each is associated with four cardinal directions (East, North, West, South) and with patron deities.

Loss and Reconstruction

Colonial loss. A significant portion of the interpretive tradition was lost during the Spanish colonization of the 16th century.

Sources of reconstruction. Modern knowledge rests on:

• Surviving codices (Codex Borgia, Telleriano-Remensis)
• The records of Bernardino de Sahagún
• Scholarship of Miguel León-Portilla and David Stuart

Alive, yet with lacunae. This makes Tonalpohualli a reconstructed system — alive, yet with unavoidable lacunae.

Place in Errarium

The only Mesoamerican one. In Errarium, Tonalpohualli (#59) represents the Mesoamerican cosmological tradition — the only one on the platform.

Analog — Dreamspell. Its closest structural analogue is Dreamspell (#48), José Argüelles's proprietary adaptation that uses the same 20×13 matrix but with substantial departures from the historical system.

The defining difference. Status as a reconstruction of a historical tradition, rather than a modern invention.