Facts about The Aztec Calendar
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Carved from basalt around 1502 CE, the monumental Aztec Calendar Stone measures roughly 3.6 meters in diameter and weighs approximately 24 metric tons.
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A single day in the Aztec Calendar could be named using 260 different combinations from the tzolkin cycle, with names like One Crocodile or Thirteen Flower determining an individual's destiny and character traits at birth.
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Aztec priests used the Calendar Stone's intricate divisions to predict solar eclipses and other celestial events with remarkable accuracy for agricultural and ritual planning.
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Compatibility between the 260-day tzolkin and 365-day xiuhpohualli cycles meant they realigned every 52 years, with only four possible base dates repeating across multiple centuries.
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Tonatiuh, the Aztec sun god, occupied the center of the Calendar Stone with his tongue extended as a sacrificial knife, symbolizing the daily cosmic struggle requiring human blood to sustain the sun's movement.
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Aztec astronomers aligned the 52-year Calendar Round with the synodic cycle of Venus, which takes 584 days and appeared as both morning and evening star in their cosmological observations.
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Tonacatepetl, the mountain of sustenance, appeared at the center of the Aztec Calendar Stone surrounded by four cardinal directions representing the four previous world creations and destructions.
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Xiuhpohualli, the 365-day Aztec agricultural calendar, tracked seasonal cycles for farming and religious ceremonies throughout the year in Mesoamerica.
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In the 260-day tzolkin cycle of the Aztec Calendar, each day combined one of twenty day names with one of thirteen numbers, creating 260 unique day combinations.
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Each of the 20 day names in the Aztec Calendar corresponded to specific deities and natural forces, with Cipactli representing the crocodile as the first day of the tzolkin 260-day cycle.
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The Aztec Calendar Stone's 365-day agricultural calendar divided the year into eighteen months of twenty days each, plus five unlucky intercalary days called nemontemi.
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Fifty-two years marked one complete cycle in the Aztec Calendar Round, after which the Aztecs performed the New Fire Ceremony to ensure the world's continuation.