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Aztec calendar divisions with the Moon

Aztec calendar divisions with the Moon

C029/1043

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Credit

LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY

Caption

Aztec calendar divisions with the Moon. Aztec year ('xiuhpohualli') into 18 equal non-lunar periods of 20 days called veintena. Anti-clockwise from top: Atlcahualo, Tlacaxipehualiztli, Tozoztontli, Huey Tozoztli, Toxcatl, Etzalcualiztli, Tecuilhuitontli, Huey Tecuilhuitl, Miccailhuitontli, Huey Miccailhuitontli, Ochpaniztli, Teotleco, Tepeilhuitl, Quecholli, Panquetzaliztli, Atemoztli, Tititl, Izcalli. An extra 5-day nemontemi period made 365 days in total. This illustration is from a 1790 work by Mexican astronomer Antonio de Leon y Gama (1735-1802) describing the discovery of an Aztec calendar stone in Mexico City that year.

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