It's a calender that using the precession of the sun in it's long count!
We are supposed to be in a mini ice-age right know - but with global warming, people aren't dying off in the cold as predicted.
"The current trends of the tilt and precession cycles should be making the Earth colder according to Figure 2 on the USDA Climate Change Resource Center website." -
To view a the Earth's precession, go to Earth's precession video here: