Jay Balcaitis wrote:will happen on December 21st
2012, and what that is, is that is the exact same day the Earth aligns with
the Sun, which aligns with the center of the Milky way galaxy, on the winter Solistice.
Almost. In fact if you think about it the Earth, Sun and "centre" of the Milky Way align once a year every year in any case. Note that because the Ecliptic intersects the galactic equator about 6.5 degrees away (that's 13 solar diameters) from the intersection of the galactic meridian and equator, it's impossible for
the Sun to lie
precisely between us and the centre of the Milky Way.
The position of the Winter Solstice point on the Ecliptic (which moves around the Ecliptic at a rate of 1 degree every 72 years or so due to
precession) has been getting closer and closer to the intersection of the Ecliptic and the galactic equator in the direction of the centre of the Milky Way over the last half-precessional cycle (approx 12,460 years).
It was in 1999 that the position of the Winter Solstice point lay directly on this intersection point.
Now the Mayans weren't using our definitions of galactic coordinates, but they were interested in the dark void in the Milky Way that is caused by a dust cloud between us and galactic centre - they viewed it as the womb of the sky. They were certainly aware of
precession, and their calendar recognises our age as being the time when
the Sun is reborn in the womb of the sky. Our settling on
2012 is due to fast-forwarding their current long count calendar based on a start date in 3114BC (by no means universally agreed).
There is, however, a particular other reason why our age is special in astronomical/precessional terms, and the noticing of this fact in the long distant past has spawned many mythologies and religions that have served to promulgate the knowledge down the millennia. When you notice it too, you'll laugh out loud.
Cheers
Simon