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 ...

Despite the mysticism that often clouds the Mayan calendar in popular culture, fact remains that the calendar system in use by the Mayans was based on a system used throughout the pre-Columbian ...

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 ...

Deena Shinn is a freelance writer and editor. When she's not writing or wrangling her two feisty daughters, you can find her experimenting with sourdough bread or exploring northern California.