reply to post by rtcctr
From what I've read, that isn't true. The Maya had various calenders for measuring different lengths of time, from the 260 day Tzolkin to the Long
count which worked over millenia.
It was using a different numbering form than we had in the West, so I do not think just scrubbing it down to a "lunar" calendar does it justice:
The most important of these calendars is one with a period of 260 days. This 260-day calendar was prevalent across all Mesoamerican societies, and is
of great antiquity (almost certainly the oldest of the calendars). It is still used in some regions of Oaxaca, and amongst the Maya communities of the
Guatemalan highlands. The Maya version is commonly known to scholars as the Tzolkin, or Tzolk'in in the revised orthography of the Academia de las
Lenguas Mayas de Guatemala.[2] The Tzolk'in is combined with another 365-day calendar (known as the Haab, or Haab' ), to form a synchronized cycle
lasting for 52 Haabs, called the Calendar Round. Smaller cycles of 13 days (the trecena) and 20 days (the veintena) were important components of the
Tzolk'in and Haab' cycles, respectively.
Mayan Calendar