Calendars - Aztec and Maya

While the Maya are known for their phenomenally accurate, complex, calculations of the orbits of stars, planets and moon, and precise reckoning of the solstices and eclipses, there is also an effective, but much more ordinary, almost easy to understand calendar. It wasn't too easy, though: Only shamans could calculate it.

Colorful representations of the current year, day, and stage of the thirteen-day cycle, with hyperlinked explanations.