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". We webcast this historic event live on this website. CLICK HERE to visit our gallery of streaming video and still images.

We'd like to thank the following organizations for their help

Lick Observatory

Orion Telescopes

AboveNet Communications, Inc.

Magnetic Image, Inc

© 1999 Exploratorium