people believe the world will end this year because the Mayans created a calender (The most accurate calender from prehistoric times) several hundred years ago and it stopped on the year 2012. I am neutral on the subject, because there is no way to know when the world will end, but if it does come to an end this year, it will be December 21, on the Winter Solstice. Hope this helped tame your curiosity.
Because the Mayan calendar, which documents the rotation of the Solar System within the galaxy, ends at the end of Sol's orbit. They fail to realise that it is the equivalent of the Gregorian calendar ending every Dec 31.