The year in the Mexican codices: the nature and structure of the eighteen Feasts

Resumen

The Mesoamerican calendar is well known for its division of the year into eighteen Feasts of 20 days (in ilhuiuh), a system which articulates  tribute with quarters, planting with seasons, dance with measure, cosmic with political time. The names and practices proper to each Feast varied over time and according to region. Yet their overall arithmetic, structure and conception can now be better perceived, thanks in part to finer facsimile reproductions of key texts, both pre-Cortesian screenfolds and post-Cortesian compendia