On June 8th, 2004, a rare astronomical phenomenon not seen since 1882 will occur. The planet Venus transits the Sun, appearing as a black silhouette visible to the unaided eye (with suitable protection for safe solar viewing). Venus will take a little more than six hours to traverse the Sun's disc. The transit is visible from anywhere on Earth where the Sun is up while it's in progress; see the map for details, or consult detailed predictions for your location. For further information, visit Fred Espenak's 2004 Transit of Venus page. If you miss this one, there's another transit of Venus on June 6th, 2012, but after that you'll have to wait until December 11th, 2117 for the next!