Final answer:
The Aztec Sun Stone served numerous functions including representing Aztec mythology, acting as a sacrificial altar, and charting ritual cycles and astronomical events.
Step-by-step explanation:
The function of the Calendar Stone, specifically referencing the Aztec Sun Stone, is a topic of debate among historians. However, the most accepted interpretations suggest that the stone served multiple purposes. It represented a solar disk displaying the myth of the five suns. The central face with the obsidian blade tongue is associated with the need for human sacrifice. The stone also acted as a historical and religious symbol charting the Aztec cosmos and was potentially used as a sacrificial altar. The design elements of the stone align with Aztec mythology and the set of 20 day symbols suggest it had a calendrical function as well. Furthermore, it framed ritual cycles and significant astronomical events important to the Aztec civilization.