I know this is a robotics forum, but this is science too :D, sorry guys.
What so special about Venus acrosses the disk of the sun? Well, transits of Venus occur in pairs that are eight years apart, then don’t happen again for more than a century. The last two Venus transits were in 1874 and 1882, so no one alive today has seen one. After transits in 2004 and 2012, there won’t be another until 2117! Half of North America will have a chance to see the tranist. But don’t worry there is also a webcast that you can fiind HERE
Observe sun* when it rises. You may see a black dot in the bottom right corner.
So Get Out There!
For more info: http://sunearth.gsfc.nasa.gov/sunearthday/2004/
*WARNING: It is extremely dangerous to obersever the sun with naked eyes. Use #14 welding Lens for eyes and special solar Filter for telescopes