Each page of a tonalamatl represented one trecena, and was adorned with a painting of that trecena's reigning deity and decorated with the 13 day-signs and 13 other glyphs. These day-signs and glyphs were used to cast horoscopes and discern the future.
Each page of a tonalamatl depicted one trecena, and was embellished with an image of that trecena's ruling deity. It featured the 13 day-signs and 13 additional glyphs used to predict fortunes and foresee the future.