Being a German engineer, 50, living in Mexico and new in this forum I´ve spend a lot of time trying to understand the Mayan calendar, but something does not fit well together from my point of view.
What I don´t understand in all explanations and theories is, how the Mayans tried to coordinate the 260 day calendar of the 13/20 rings to a 365 days ring, even they knew that the earth year is 365.25 days. As I understood they had each year a time correction of 6 hours, starting days at morning, noon, evening and night. The Mayan culture is always described, that they had very detailed astronomic skills and related their life and year to stars constellation. So where did they take the numbers 13 and 20 from.
Hoping that these questions won´t appear too stupid I look forward to receive any response.