MYTHS OF MEXICO AND PERU
will be found to be the basis in the time-reckoning of the Mexicans, who designated it cempohualli. Each day included in it was denoted by a sign, as "house," "snake," "wind," and so forth. Each cempohualli was subdivided into four periods of five days each, sometimes alluded to as "weeks" by the early Spanish writers, and these were known by the sign of their middle or third day. These day-names ran on without reference to the length of the year. The year itself was designated by the name of the middle day of the week in which it began. Out of twenty day-names in the Mexican "month" it was inevitable that the four calli (house), tochtli (rabbit), acatl (reed), and tecpatl (flint) should always recur in sequence because of the incidence of these days in the Mexican solar year. Four years made up a year of the sun. During the nemontemi (unlucky days) no work was done, as they were regarded as ominous and unwholesome.
We have seen that the civil year permitted the day-names to run on continuously from one year to another. The ecclesiastical authorities, however, had a reckoning of their own, and made the year begin always on the first day of their calendar, no matter what sign denominated that day in the civil system.
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.
