Kalender: Forskelle mellem versioner

Mayaernes kalender og andre mellemamerikanske kalendere består af flere delkalendere:

<ref name="tondering">[http://www.tondering.dk/claus/cal/node10.html Frequently Asked Questions about Calendars, Version 2.9, Claus Tøndering, 4 April 2008: 9. The Maya Calendar] Citat: "...We can therefore derive a value for the Mayan estimate of the year by dividing 1,101,600 by 365, subtracting 2, and taking that number and dividing 1,101,600 by the result, which gives us an answer of 365.242036 days, which is slightly more accurate than the 365.2425 days of the Gregorian calendar...(This apparent accuracy could, however, be a simple coincidence...)..."</ref>

<ref>[http://web.archive.org/20011128154246/www.geocities.com/a1ma_mia/calendar/mesocal.html Mesoamerican Calendars] Citat: "...Finally, many other Mesoamerican cultures, notably the [[Olmek|Olmecs]] who are credited with the invention of the Mesoamerican calendar, had adopted similar calendars as the Mayas and the [[Azteker|Aztecs]]. Such was the case of the [[Zapotec]]s, [[Mixtec]]s, Otomies, Tarascans, and many others, some of which continued to preserve their calendar. [1,2]...The [[Tarascan]]s or [[Purepecha]] had a similar calendar as the Aztecs, but started the year on different days..."</ref>

<ref>[http://www.math.nus.edu.sg/aslaksen/gem-projects/hm/0304-1-18-mayan_calendar.pdf National University of Singapore, GEK1506 Heavenly Mathematics: Highlights of Cultural Astronomy] Citat: "...However, the Mayans did not use the leap year concept as the Gregorian calendar does. Instead, they just keep track of the errors in the calendar...The Mayans actually chose a certain date to record this calculated errors. They chose the date 4 Ahau 8 Cumku that repeated every 52 haab years. During each of this repetition, they would calculate the accumulated error and