Long Count

Screenshot: Long Count (0.12)

Disk Clock has disk sets for both the apocalyptic 13-baktun, and the 20-backtun.

The Long Count is another mesoamerican calendar. It was used for recording large scale events that extended beyond the 52-year cycle. It was based on ‘digits’ of 20, with one 18 to make the lower two digits approximate a year. There are at least two versions – one popular rendition has a digit of 13 instead of 20, which will cause the whole cycle to roll over at December 20, 2012. (The other view assumes that the digit counts to 20, like all the rest.)