Groups of Years

As has been indicated, the years were formed into groups. Thirteen years constituted a xiumalpilli (bundle), and four of these a nexiuhilpilitztli (complete binding of the years). Each year had thus a double aspect, first as an individual period of time, and secondly as a portion of the “year of the sun,” and these were so numbered and named that each year in the series of fifty-two possessed a different description.