Originally posted by GeneralLee
No worries. A year is a year and in a "Leap Year" it's no different. I may be wrong but no one has actually come out and mentioned exactly what day all these earth shattering events will occur in 2012. Might be a good excuse though if (like I believe) nothing actually happens! "Oh, we forgot to implement the leap year equation"!!!! The 503 day variable, plus or minus, more or less. Of course if it happens 503 days before, it probably won't matter as no one will be around to say I told you so!
The most important of these calendars is one with a period of 260 days. This 260-day calendar was prevalent across all Mesoamerican societies, and is of great antiquity (almost certainly the oldest of the calendars). It is still used in some regions of Oaxaca, and amongst the Maya communities of the Guatemalan highlands. The Maya version is commonly known to scholars as the Tzolkin, or Tzolk'in in the revised orthography of the Academia de las Lenguas Mayas de Guatemala. The Tzolk'in is combined with another 365-day calendar (known as the Haab, or Haab' ), to form a synchronized cycle lasting for 52 Haabs, called the Calendar Round. Smaller cycles of 13 days (the trecena) and 20 days (the veintena) were important components of the Tzolk'in and Haab' cycles, respectively.
If they'd still been carving in stone, they would be carving a new one.
Originally posted by stumason
Leap years only apply in the Gregorian calender where the actual year is longer than that portrayed on the calender, about 1/4 of a day in fact. so every 4 years, we add another day on our calender to make up the difference.
The Mayan calender, presumably, is accurate in measuring the correct length of a year, so it has no need for leap years....