NASA | SDO's Ultra-high Definition View of 2012 Venus Transit
2004-06-08 07.23.16 Transit of Venus 8.6.04.avi
A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and a superior planet, becoming visible against the solar disk. During a transit, Venus can be seen from Earth as a small black disk moving across the face of the Sun. The duration of such transits is usually several hours.