As the planet wobbles, once every 26,000 years we visually align with the center of the galaxy. But it's such a slow movement that as we enter the galactic equator (The band of stars in the sky - The Milky Way), it takes 18 years to get to the middle of it, and another 18 to exit it. So astronomically, "The 2012 experience" is a 36 year alignment process, not something that happens on Dec 21, 2012.
