As the planets dance in their orbits, Venus passes directly between the Earth and the Sun – always in either June or December – at unmistakable intervals of 8 years; 121 and a half years; or 105 and a half years. The Venus transit of 2004 was photographed by the TRACE satellite, a science probe launched to study the Sun. The next pair of Venus transits will take place in December 2117 and December 2125. This is SPACE.com.