dec 22, 2012 BC - Mayan calendar
Description:
The Maya calendar consists of several cycles or counts of different lengths. The 260-day count is known to scholars as the Tzolkin, or Tzolk'in. The Tzolkin was combined with a 365-day vague solar year known as the Haab' to form a synchronized cycle lasting for 52 Haab', called the Calendar Round.
Maya calendar - Wikipedia
https://en.wikipedia.org/wiki/Maya_calendar
Added to timeline:
Kaleb Blythe Iron academy project
Date:
