Skywatchers on every continent except Australia will be able to see the phenomenon, which like a solar eclipse is caused by Earth's shadow blocking sunlight from reaching a portion of the moon's surface.
A lunar eclipse is different from its solar counterpart, however, because observers do not need to wear protective glasses to view it safely.
This eclipse, the second of 2003, will be lighter than the first one, astronomers say. The moon will remain relatively bright, and there will be a pleasing color gradient across its face, going from pale white on one side to crimson red on the other.
For places and times to view the eclipse, go to NASA's Eclipse Home page: sunearth.gsfc.nasa.gov/eclipse/eclipse.html.