the mayan calander ended the world on 12/21/2012 because thats when we will be alligned with the center of our galaxy. a phenomena that occurs something like once every 25,000 years. the world isnt going to end, the mayans thought they would be taken to this center.plus the clander had to end somewhere or the guy who made it would still be making it. its really crazy how accurate thier calander is, its the most accurate one ever created.