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
Melanau calendar Melanau calendar The Melanau calendar () is a calendar used by the Melanau people of Borneo. Its year consists of 12 months. The first month, "Pengejin", signifies the celebration of the Kaul festival (a giving of thanks for the preceding year, with prayers for the year ahead). Each month in the Melanau calendar consists of 30 days. It is guided by the constellations, natural phenomena and guardian spirits. Each month is named for occurrences during the month or events which are supposed to have occurred during that particular month, according to legend. The rise and fall of the Sun, the