How is the Aztec calendar different from ours?
The Aztec calendar is made up of two interlocking cycles, the 260-day Sacred Calendar and the 365-day Solar Calendar, creating a 52-year calendar round. This is different from our Gregorian calendar, which is a 365-day solar calendar with a leap year every four years. Additionally, the Aztec calendar was based on a combination of astronomical observations, religious beliefs, and mathematical calculations.