What are the names of the two aztec calendars? what do they keep track of?

The two names of the Aztec calendars are:

The xiuhpōhualli is a 365 days type of calendar. The months in this calendar are made up of 20 days each.

The use of this 365 day calendar was basically to track religious festivals and other ceremonies. It was used to tell the time that the festivals have to be held.

The tōnalpōhualli had a cycle of 260 days. The significance that it had was that it was the sacred calendar of the Aztecs.

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