On June 8th, 2004 a celestial event of historical scientific importance occured when the silhouette of the planet Venus crossed the face of the Sun as seen from the Earth. This event, known as the transit of Venus, last occurred in 1882. Through parallax measurements, it allowed astronomers to define, for the first time, a fairly accurate number for the A.U. and therefore, the distance to all the other known planets. This article describes resources that science teachers can use to enhance their classroom teaching by incorporating this spectacular event into their science curriculum.