Not the end of the world!! We didn't spend billions of years mutating to get to a point in the clockwork to stop. It's a continuous cycle.
Think about the last 200 years and how we have progressed, think of that as a racing car building up speed, at some point it needs to change up a gear. It's still the same car on the same track but moving at a different rate.
I don't know much about astrology but I do know a bit about the fibonacci code and the golden ratio and how it relates to the macro/microcosm.
So the Mayans developed a calendar, infact they had 2 calendars which together calculated movements of many stars in our universe on a mass scale. Then at some point the western world was forced to take onboard the gregorian calendar, in the scheme of things thats not a very big cycle.
Every now and then apparently the poles of the Earth swap, apparently due to in 2012.
Check this talk out, I've picked a clip which is a quick look at it but set some time to watch the whole thing...
http://www.youtube.com/watch?v=BuHrqObcovk