The Calendar System
As has been said, the calendar system was the source of all Mexican science, and regulated the recurrence of all religious rites and festivals. In fact, the entire mechanism of Nahua life was resident in its provisions. The type of time-division and computation exemplified in the Nahua calendar was also found among the Maya peoples of Yucatan and Guatemala and the Zapotec people of the boundary between the Nahua and Maya races. By which of these races it was first employed is unknown. But the Zapotec calendar exhibits signs of both Nahua and Maya influence, and from this it has been inferred that the calendar systems of these races have been evolved from it. It might with equal probability be argued that both Nahua and Maya art were offshoots of Zapotec art, because the characteristics of both are discovered in it, whereas the circumstance merely illustrates the very natural acceptance by a border people, who settled down to civilisation at a relatively later date, of the artistic tenets of the two greater peoples who environed them. The Nahua and Maya calendars were in all likelihood evolved from the calendar system of that civilised race which undoubtedly existed on the Mexican plateau prior to the coming of the later Nahua swarms, and which in general is loosely alluded to as the “Toltec.”