Scholars show how multiple planet movements tie into the 819-day Mayan calendar. The 819 days of the calendar must be viewed across a 45-year time period to fully understand. The movements of all ...

Archaeologists found the calendar fragment among a total of 249 pieces of painted plaster and painted masonry block. Photograph by Karl Taube / Courtesy of the Proyecto Regional Arqueológico San ...

If you thought 365 days was a long time, try resetting your calendar every 18,980 days instead. 52 solar years make up the longest cycle of the Mayan calendar – a complex and ancient system that’s ...