JOHN CHUMACK / SCIENCE PHOTO LIBRARY JOHN CHUMACK / SCIENCE PHOTO LIBRARY
June 8, 2004 Venus Transit. Venus passes in front of the Sun, appearing as a black dot. This event is known as a transit, and is the first time it has occurred for Venus since 1882. The first transit of Venus was observed on 4th December 1639. In history, the transits were used to measure the size of the Solar System. Venus orbits the Sun at a distance of some 108 million kilometers, just over two- thirds of the Earth-Sun distance.
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