Computes the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena. Includes information on calendars and related topics.

List of links for those, who want to examine theories that are on the fringe of accepted scientific thought that are related connected to astronomy. A few examples are astrology, UFO's, the "Face" on Mars, and ancient astronaut theory.

A web encyclopedia. Over 500 entries, ranging from definitions to full articles.

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

General astronomy tutorial, education links, web courses, documents at the UCSD Center for Astrophysics and Space Sciences.

Fun facts and trivia relating to astronomy, space, science fiction movies. Most trivia items are submitted by users.

Resources, searchable forums and searchable lists of organizations providing astronomy services.

Information and articles on astronomy, space and related topics. Also features a friendly forum and a telescope buyer's FAQ page.

Astronomical internet resources from the National Radio Astronomy Observatory.

Contains 3D maps of the universe zooming out from the nearest stars to the scale of the galaxy and out to the surrounding superclusters and finally to the scale of the known universe.