On November 15th, 1999, the western Hemisphere was treated to an astronomical event unseen for 25 years. On that day, the tiny planet Mercury passed between us and the sun--an event known as a "transit." Here is one of five short streaming videos detailing the four important "contact" points and mid-transit. Note that the sound you hear is a timing track recorded from the WWV radio service. Depending on the computer you use, the clock may "tick" fast or slow. Apparently RealMedia does not respect the integrity of time!