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  2. Tzolkʼin - Wikipedia

    en.wikipedia.org/wiki/Tzolkʼin

    The tzolkʼin calendar combines a cycle of twenty named days with another cycle of thirteen numbers (the trecena), to produce 260 unique days (20 × 13 = 260). [2] Each successive named day is numbered from 1 to 13, and then starting again at 1.

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