Well What is the Galactic Alignment in 2012? Here is definition form Wikipedia, Galactic Alignment; One common galactic alignment refers to an alignment between the December solstice sun with the equator of our galaxy, the Milky Way.
The galactic equator is a reference line that describes 0 degrees longitude and 0 degrees latitude, and acts as a divisional line between the northern and southern hemispheres of the observed Milky Way. Which happens one degree every 71.5 years. Because the sun is one-half of a degree wide, it will take the December solstice sun 36 years to precess through the galactic equator.

One growing movement points precisely to the culmination of history as we know it on December 21, 2012, or 12/21/12. That is the last date on the Mayan long-count calendar and the precise day arrived at by one computer analysis of the I Ching. The theory has spread from new age circles to mainstream astronomers and media, and is even being debated in college courses.

On January 4, The History Channel airs Nostradamus: 2012, speculating on prophesies by the 16th century French apothecary.
Also read on- 
Galactic Alignment with the Full Moon on the Winter Solstice December 22, 1999
related:2012, 2012 galactic alignment, 2012 alignment, december 21 2012, galactic alignment 2012
Also read on Mayan long-count calendar and What Amma Bhagvan Says about it?