The Mayan Calendar is an ancient system used by the Maya civilization to track time and organize their agricultural and religious activities. It consists of several interlocking cycles, the most notable being the Tzolk'in, a 260-day calendar, and the Haab', a 365-day solar calendar. These calendars were used together to create a larger cycle known as the Calendar Round, which lasts 52 years. The Mayan Calendar is famous for its complex structure and its role in Mayan cosmology. It reflects the Maya's deep understanding of astronomy and their belief in the cyclical nature of time. The calendar also played a significant role in their rituals and ceremonies, marking important events and festivals throughout the year.