The Mayan calendar’s 819-day cycle has confounded ... From there, though, we need to start extrapolating out the 819 number, and if you chart 20 cycles of 819, you can fit every key planet ...

The Maya numerical system is based on factors of 20. So Maya numbers are composed of units of 1, 20, 400, and so on. To write the number 403, for example, a Maya would use a symbol for one unit of ...