06-05-2012 04:06 PM - edited 06-05-2012 04:32 PM
The next time this will happen is December 2117. It has just started about 30Minutes ago and will last 7Hours.
You can view and interact on the following Web Links at N.A.S.A.:
Throught these Web Links, you can discover more information about this. Enjoy!
Do not look at the Sun directly with the Naked Eye! You don't even feel the effects of the damage being done; when you do feel pain, then it is already too late! There are tips on the Web Links about how to view Venus crossing the Sun safely.