In the decimal structure of time in this system, how many days make up a Tun?

In the context of the Mayan calendar, a Tun is a unit of time that consists of 360 days. This system is part of a larger structure in which time is segmented into various units, each with its own specific duration. The 360-day count is significant as it reflects the techniques and practices the Maya employed in their calculations and observations of celestial events.

The choice indicating 365 days, often aligns with the more familiar Gregorian calendar but does not correspond to the Tun specifically. Other durations such as 370 days or 390 days also do not accurately represent the definition of a Tun within the Mayan calendar system. Thus, understanding the Tun's structure is essential for grasping how the Mayans approached timekeeping, which was distinct from contemporary Western concepts of time.