Mesoamerican Long Count calendar Mesoamerican Long Count calendar The Mesoamerican Long Count calendar is a non-repeating, vigesimal (base-20) and base-18 calendar used by several pre-Columbian Mesoamerican cultures, most notably the Maya. For this reason, it is often known as the Maya (or Mayan) Long Count calendar. Using a modified vigesimal tally, the Long Count calendar identifies a day by counting the number of days passed since a mythical creation date that corresponds to August 11, 3114 BCE in the Proleptic Gregorian calendar. The Long Count calendar was widely used on monuments. The two most widely used calendars in pre-Columbian Mesoamerica, were the 260-day Tzolk'in
Yoruba calendar Yoruba calendar The Yoruba calendar ("Kojoda") is a calendar used by the Yoruba people of southwestern Nigeria and southern Benin. The calendar has a year beginning on the last moon of May or first moon of June of the Gregorian calendar, and an era of 8042 BC. The new year coincides with the Ifá festival The traditional Yoruba week has four days. The four days that are dedicated to the Orisa go as follow: To reconcile with the Gregorian calendar, Yoruba people also measure time in seven days a week and four weeks a month. The four-day calendar was dedicated