In a rare event, Tuesday, June 5, 2012, Venus will make its second of two trips across the visible surface of the sun — trips that won't reoccur for another 115 years.On June 8, 2004, Venus made the last transit across the sun and scores of people, like this crowd in Mishawaka, Indiana, gathered to witness the event. Just below in Figure A, is a composite image of the 2004 transit, recorded by NASA's TRACE sun-observing spacecraft. As you can see, Venus is passing in front of the edge of the sun. The bottom left is an ultraviolet image and the bottom right is extreme ultraviolet.
Image credit: NASA/LMSAL
Now, eight years later, it will happen again and groups all across the US, as well as other countries are gathering once again. Depending on your location in the world, you may not be able to see it, but there will be plenty of publicly available live imagery available. The Slooh Space Camera and NASA Edge are providing live broadcasts of several worldwide feeds, especially those in the sweet spot — the South Pacific (where the entire transit will be visible) — during the event. Also, NASA's Solar Dynamics Observatory is watching the event, so there will be plenty of high-resolution images available.