Published by John Wiley & Sons, New York

October 2003

The most up-to-date and comprehensive encyclopedia of astronomy available

"... a first-rate resource for readers and students of popular astronomy and general science. [A] true encyclopedia, with over 3,000 alphabetically arranged entries covering history, biography, celestial objects, cosmological phenomena, and more."

- Library Journal, November 2003

Extensively cross-referenced

In-depth

Written entirely in the 21st century, including discoveries up to July 2003

240 illustrations, color and B&W

570 pages