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| Codex Laud, folio VIII at FAMSI |
Time is spiralled, time is spun; time weaves tendrils through the days.
Tonight we mourn the dying sun; tonight my heart will feed the flames.
Fragments of Berossus, Alcor
In the pre-Columbian era, before the Spanish conquest, a variety of calendrical systems were in simultaneous use by the cultures of Mesoamerica, including both the Maya and the Aztec.For the Aztec, two systems, the 260-day cycle (tonalpohualli) and the 365-day cycle (xiuhpohualli), were particularly important. The 260-day cycle comprised thirteen repetitions of twenty day names, and the 365-day period consisted of eighteen such "veintenas" (the Spanish name; the original Nahuatl is no longer known) plus five nemontemi, or nameless days.
Because of the disparate lengths of the two cycles, the combination of tonalpohualli and xiuhpohualli dates formed an even longer cycle of approximately 52 solar years (365.25 days). After 18,980 days (the smallest number divisible by both 260 and 365; 18,980 = 73 x 260 and 52 x 365) the calendar combinations would then repeat* if the world did not end first — which could only be prevented by human sacrifice.
