13 agos 3113 anni a. C. - Mayan Calendar Start

Descrizione:

The Maya calendar consists of several cycles or counts of different lengths. The 260-day count is known to scholars as the Tzolkin, or Tzolkʼin.[5] The Tzolkin was combined with a 365-day vague solar year known as the Haabʼ to form a synchronized cycle lasting for 52 Haabʼ, called the Calendar Round. The Calendar Round is still in use by many groups in the Guatemalan highlands.

https://en.wikipedia.org/wiki/Maya_calendar