The reasoning behind why December 21, 2012 (12-21-2012) is thought to be the date of the Apocalypse or any other type of ending of civilization is that, not only is that the date the Mayan Calender ends, but also there are solar and lunar eclipses that look a little less than promising.
Wanting to further my knowledge on the matter, I decided to use my failsafe for everything - Wikipedia. Of course it had the options 2012, 2012 (film), or 2012 doomsday prediction. I remained on the first page. The very top of the page had, as it often does, a summary of whatever was searched.
"This article is about the year. For metaphysical and cosmological predictions centered on December 21, 2012, see 2012 doomsday prediction. For the 2009 film by Roland Emmerich, see 2012 (film). 2012 (MMXII) will be a leap year starting on Sunday of the Gregorian calendar.It has been designated Alan Turing Year, commemorating the mathematician, computer pioneer, and code-breaker on the centennial of Turing's birth."
I continued reading. The very first section of information was titled;
"Predicted and Scheduled Events"
Shockingly, a month to month synopsis of events that have been over three years pre-scheduled.
These are all of the "Unknown Dates" in the year 2012 of things that are going to happen.
"Ireland will cease analogue television broadcasts.
China will launch the Kuafu spacecraft.
Pleiades, a proposed super computer built by Intel and SGI for NASA's Ames Research Center, will be completed, reaching a peak performance of 10 Petaflops (10 quadrillion operations per second).
Sequoia, a proposed super computer built by IBM for the National Nuclear Security Administration will be completed, reaching a peak performance of 20 Petaflops.
Start of the commercial operation of the first unit from the Novovoronezh Nuclear Power Plant II.
The 108 ft (33 m) Elwha Dam and 210 ft (64 m) Glines Canyon Dam will be removed from the Elwha River in Washington state, marking the largest dam removal project in history.
The Canberra class light aircraft carriers/large amphibious ships, the largest ships ever to be operated by the Royal Australian Navy, will be in service.
On the sun, the solar maximum of Solar Cycle 24 in the 11-year sunspot cycle is forecast to occur. Solar Cycle 24 is regarded to have commenced January 2008, and on average will reach its peak of maximal sunspot activity around 2012. The period between successive solar maxima averages 11 years (the Schwabe cycle), and the previous solar maximum of Solar Cycle 23 occurred in 2000–2002. During the solar maximum the sun's magnetic poles will reverse.
The United Kingdom will complete a 5-year process to cease analogue television broadcasts region-by-region, with Meridian Broadcasting, ITV London, Tyne Tees Television and UTV being the last areas to switch off analogue.* Portugal will also cease their analogue television broadcasts, after a 4-year simulcast with digital ones. After that, DVB broadcasts will be the only system to be used in television (DVB-C for cable, DVB-T for terrestrial and DVB-S for satellite). The five free-to-air channels on terrestrial network will also start broadcasting in high-definition 24-hours a day. "
Apparently, Wikipedia can now tell the future. Just make sure to pack a space blanket.