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General facts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects.

Learn about astronomy; goes into lots of details, and also has lots of astro-clip art.

The Astronomical Applications Department of the U.S. Naval Observatory computes, from fundamental astronomical reference data, the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena. This information is of critical importance to navigation, military operations planning, scientific research, surveying, accident reconstruction, architecture, and everyday activities. The products of the AA Department - publications, software, algorithms, and expertise - are used by the U.S. Navy and the other armed services, civilian government agencies, the scientific research community, and the public. Our products are regarded as benchmark standards throughout the world. The department also carries out a modest research program in celestial mechanics and positional astronomy to enable it to meet future needs.

The Astronomy Net contains articles, forums, clubs, vendors, manufacturers and other resources important to those interested in Astronomy. Resources, searchable forums and searchable lists of organizations providing astronomy services.

Astronomy Today - articles on astronomy, cosmology, space, our solar system and space exploration, with a monthly sky guide.