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.