This post for stackexchange is an even better explanation of how they came to December 21, 2012 for the end of the Mayan long count calendar.
yes, the Mayan calendar did not include leap days. But, it didn’t need to, since they didn’t have anything to do with solar years. In fact, as you can see, the closest equivalent Mayan period to a solar year, a tun, is only 360 days — already five days off.
In a nutshell you can just figure out what day on our calendar equals day zero on the Mayan calendar. The article says that day is: August 11th, 3114 B.C.
The entire Mayan calendar is 1,872,000 days long. So you just start at August 11, 3114 B.C. and start counting of those 1.8 million days. Yes, we counted here at bilocation and indeed, you come up with December 21, 2012.
Nice uplifting post about what the actual Mayan belief is for what is to come:
Mayan spiritual leader in the Guatemalan Highlands, he welcomes people from all cultures to join in on the celebrations by showing their appreciation and praying for the new cycle to be better and to help replenish the Earth, and wash it from the troubled times it has seen.
He lists many important Mayan locations to consider but I liked his home-country recommendations:
If you do find yourself in Guatemala, I would say the place to be would be the ancient and famous city ruins of Tikal. I imagine there will be hundreds if not thousands of people there to celebrate this day. If you are looking for something a little more out of the way, the ruins at El Mirador would be a great choice. It is a three-day hike to get there, so you wouldn’t have the numbers, but the spiritual experience would be remarkable. Really though, with so many ruin sites scattered around the country, there will be no shortage of ceremonies and parties going on!
If you can’t be in Mayan places, his final recommendation is just as good:
…make sure you go outside and feel the sun if possible. Of course it may be cloudy and you may not feel the sun directly, but go out and appreciate this last sunlight of the fifth age. Welcome the sixth age, and pray (in your own way) that the new age will bring better times to our planet, and that mankind will evolve. That we will learn to take better care of the Earth and nature. That we will learn to change our destructive ways and become a peaceful and sustainable species.
According to that last article, humans are represented by different materials in each age in their calendar:
In previous cycles, man was made from different things, such as wood and earth. Those were imperfect designs, and humankind had been evolving. This year marks the end of the Men of Corn, and we wait to see what the next incarnation will be.
Can’t wait actually. It is very interesting that with the rise of communication technology and the connection of everyone on the planet we have an ancient epoch ending. Perhaps it’s simply coincidence (how many different ancient epochs end each year, really?) but it’s a compelling argument to make that Mayan age or no, we are entering a new phase of humanity.
Here’s another article debunking all the Mayan Calendar nonsense. Niburu is really the easiest to disprove and gets a specific debunking:
“Niburu and Planet X are the same thing, and neither one exists,” Morrison said. “If it were real, astronomers would have been tracking it, and by now it would be the brightest thing in the sky after the moon.