El Tonalpohualli: forma y contenido serpentino

The purpose of this article is to demonstrate the meaning and the serpentine form of the 260-day ritual calendar, called tonalpohualli among the Nahuatls, which is represented on pages 61 to 70 of the Borgia Codex (Figure 1). There, the sequence of the twenty trecenas is located with their divine patrons, also known as "the lords of the 20 trecenas."