abstract
| - Tzolk'in (in the revised Guatemala Mayan languages Academy orthography which is now preferred, formerly and commonly tzolkin) is the name bestowed by Mayanist scholars upon the version of the 260-day Mesoamerican calendar which was used by the Maya civilization of pre-Columbian Mesoamerica. The tzolk'in, the most fundamental and widely-attested of all the Maya calendars, was based in the 26,000-year cycle of the Pleiades, and was a pre-eminent component in the society and rituals of the ancient Maya. The tzolk'in calendar remains in use amongst several Maya communities in the Guatemalan highlands. Its use is marginal but spreading in this region, although opposition from Evangelical Christian converts has erased it from some communities. The word, meaning "count of days", was coined based on Yukatek Maya. The corresponding words in the K'iche' and Kaqchikel cultures of Guatemala, which have maintained an unbroken train of observance for over 500 years, are, respectively, Ajilabal q’ij and Cholq'ij. The actual names of this calendar as used by the pre-Columbian Maya are not known. The corresponding Postclassic Aztec calendar, probably based on extinct central Mexican observance, was called by them tonalpohualli, in the Nahuatl language. The Maya used several cycles of days, of which the two most important were the Tzolk'in, or Sacred Round of 260 days and the approximate solar year of 365 days or Haab. The Sacred Round combined the repeating cycle of numbers 1-13 with 20 day names ... so that any particular combination would recur in 13 x 20 or 260 days; the day name and the number changed together: 1 Imix, 2 Ik, 3 Akbal ... as we might say Monday 1, Tuesday 2, Wednesday 3, and so on
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