What were the names of the two calenders the Aztecs used?

The Aztecs used two primary calendars: the Tonalpohualli and the Xiuhpohualli. The Tonalpohualli, a 260-day ritual calendar, consisted of 20 periods of 13 days, while the Xiuhpohualli was a 365-day solar calendar divided into 18 months of 20 days each, plus an additional short month of 5 days. Together, these calendars helped the Aztecs manage agricultural, ceremonial, and social events.