Understanding when, where, and how the Mesoamerican calendar developed is important because the 260-day system underlies many aspects of Maya cosmology, religion, and social life.

Archaeologists say they have found the earliest-yet evidence of a Mesoamerican calendar in fragments of painted murals made in what is now Guatemala over 2,000 years ago.

“Einstein was not the first person to say that space and time were connected; the Mesoamerican expression of this was just a little bit different,” quipped Claudia Brittenham as the audience’s ...

Prior research has shown that ancient people living in Mesoamerica had developed and used a 260-day calendar as far back as 300 to 200 B.C. The written evidence was found on plaster mural fragments .

The number 20 appears to keep showing up in the constructions as well—thought to be a significant figure in Mesoamerican calendars. ... Aguada Fénix was a Mayan construction.

Was the Mayan calendar ever changed or did they keep the same system through the milennia? Makes me wonder what the longest continuously used calendar system was. I think the Jewish calendar ...