The New Fire Ceremony, also known as the Binding of the Years Ceremony, was a ritual held every 52 years in the month of November on the completion of a full cycle of the Aztec solar year (xiuhmopilli). The purpose of it was none other than to renew the sun and ensure another 52-year cycle. The New Fire Ceremony, or Toxhiuhmolpilia, as the Aztecs themselves called it, was by far the most important event in the religious calendar because, quite simply, if the ceremony failed, then the Aztec civilization would end.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/866/the-aztec-new-fire-ceremony/.