200 days - transition points

Both the Venus Transit and the "end" of the Mayan calendar are forecast as transition days by the media.

Venus is physically transiting the sun, that's a no brainer.  And the December 21st date next year is often called "transitional" by the media.

http://www.globaltoronto.com/experts+say+end+of+mayan+calendar+in+2012+just+a+transition+point/6442546977/story.html

There are exactly 200 days between the events.