A transit of Venus across theSun takes place when the planet Venus passes directly between the Sun and Earth (or another planet), becoming visible against (and hence obscuring a small portion of) 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 measured in hours (the transit of 2012 lasted 6 hours and 40 minutes). A transit is similar to a solar eclipseby the Moon. While the diameter of Venus is more than 3 times that of the Moon, Venus appears smaller, and travels more slowly across the face of the Sun, because it is much farther away from Earth.
It was visible in its entirety from Hawaii, Alaska, Australia, New Zealand, the Pacific and Eastern Asia, with the beginning of the transit visible from North America and the end visible from Europe. The next Venus Transit is expected to happen on 10–11 December 2117