Sepia Photograph, 7.25" x 4.5". Plaque on base supporting the stone reads in part (in translation): "Aztec Calendar or Sun Stone. In the month of December in the year of 1790, while leveling the ground for a new pavement in the Plaza Mayor of the capital city, this monolith was discovered and set at the foot of the western tower of the [National] Cathedral ... it was moved from this location to this Museo Nacional in August of 1885."
The Aztec calendar, or Piedra del Sol (Sun stone). 1890. From Woodson Research Center, Rice University, Charlotte and Maximilian collection, 1846-1927, MS 356. http://hdl.handle.net/1911/21804.