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The Mayan calendar system, shared across Mesoamerica, is built upon two concurrent cycles: a 260-day ritual cycle (Tzolkin) and a 365-day solar year (Haab). When these cycles intermesh, they form a larger 52-year period known as the Calendar Round, after which specific day combinations repeat. The Tzolkin, used for divination, combines numbers 1-13 with 20 day names. The Haab year consists of 18 months of 20 days each, plus five unlucky days. To record longer historical periods, the Maya developed the Long Count, a continuous count of days from a base date in 3114 BCE, using units like kin (day), uinal (20 days), tun (360 days), and katun (7,200 days).12

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