|Transit of Venus, photographed from Minneapolis on 5 June 2012 at 18:00:36 CDT, 23:00:36 UTC. Courtesy of Tom Ruen|
Venus transits are of great scientific importance. Historically, they were used to calculate the first realistic estimates of the size of our Solar System. In 1769, Captain Cook used a Venus transit to get an estimate of the distance between the Earth and the Sun and gain an idea of the size of the Solar System and our place in it.