What was the Aztec calendar used for?

The Aztec calendar was primarily used to track time and organize the agricultural and religious activities of the Aztec civilization. It consisted of two main cycles: a 260-day ritual calendar called the Tonalpohualli, which was used for religious ceremonies, and a 365-day solar calendar known as the Xiuhpohualli, which was used for agricultural purposes. The calendar also played a crucial role in the Aztecs' understanding of cosmology and the cycles of nature, helping them to predict seasonal changes and plan harvests. Ultimately, it served as a vital tool for maintaining the social and spiritual order within Aztec society.