Ancient Zapotec builders in Mexico may have used a mathematical code linked to time, death, and religious beliefs to design the sacred city of Mitla. New research suggests that the city’s buildings followed precise measurement rules that reflected how the Zapotec people understood the universe.
The study, published in the journal Ancient Mesoamerica, was conducted by Geneviève Lucet of the National Autonomous University of Mexico. Lucet examined doorways, columns, courtyards and tombs at Mitla, in southern Mexico’s Oaxaca region. The findings offer new insight into Zapotec architecture and city planning, challenging earlier theories that the buildings lacked a consistent measurement system.
Zapotec builders followed precise mathematical rules
Lucet identified evidence of a measurement system based on a unit of approximately 8 centimeters, or 3.1 inches. This was roughly the width of four fingers placed together. Builders multiplied this unit to calculate larger dimensions. Measurements of 1.84 and 1.92 meters appeared repeatedly across the site.
The researcher analyzed nine architectural complexes within three major groups known as the Church, Arroyo, and Columns. She found that different structures followed specific measurement patterns, suggesting deliberate planning rather than irregular construction.
Ancient measurements may reflect calendar cycles
The study also identified possible connections between Mitla’s architecture and Mesoamerican calendars. The number 52 held special importance in ancient Mesoamerica. Every 52 years, the 365-day solar calendar and 260-day ritual calendar completed a shared cycle. In Hall 21 of the Columns Group, Lucet found that the combined width of doorways and columns equaled 156 basic measurement units, exactly three times 52.
Researchers have uncovered a hidden measurement system in Mexico's ancient city of Mitla, suggesting Zapotec architects used numbers to reflect calendar cycles, religious beliefs and ideas about death and the afterlife. pic.twitter.com/JUcDiyytC0
— Tom Marvolo Riddle (@tom_riddle2025) November 5, 2026
Similar patterns appeared in other parts of Mexico, suggesting that builders may have incorporated calendar cycles into their designs. Other ancient sites in Mexico have also revealed possible connections between architecture and astronomical events.
Sacred buildings may reflect beliefs about the afterlife
Mitla, known to the Zapotec as Lyobáa, meaning “the place where souls rest,” was an important religious center. Earlier investigations also identified possible underground passages linked to Zapotec beliefs about the underworld at the site.
In Complex E, Lucet found that an altar stood away from the courtyard’s center. Its position followed numerical patterns involving nine and 13, numbers associated with night, day, and the universe in some Mesoamerican traditions. The researcher also identified similar measurements at nearby archaeological sites, including Atzompa and Suchilquitongo.
Although their symbolic meanings remain uncertain, the findings suggest that Zapotec architects used mathematics to express religious beliefs as well as guide construction.
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