"This site is a tool for amateur astronomers who love to pursue deep sky objects. It employs a web-based version of the Saguaro Astronomy Club's database (ver 7.2), consisting of over 10,000 records. This online version of the SAC database allows amateur astronomers to compile detailed and customized observing lists," says the text on the Deep Sky Database homepage maintained by members of the...

The International Planetarium Society (IPS) is the largest organization of planetarians on the planet, boasting members from every continent. The IPS Planetaria Around the World page is an extensive listing of professional planetariums worldwide. The listing is divided by geographic region, covering Africa, Asia, Australia, Europe, the Middle East (not currently available), North America, and...

The Lunar and Planetary Institute (LPI) "is a focus for academic participation in studies of the current state, evolution, and formation of the solar system." The LPI Web site contains a helpful and handy resource for professionals and researchers. Called Journal Web sites, this simple database contains a list of dozens of obvious and not so obvious journals and publications, such as the...

"The SIMBAD astronomical database provides basic data, cross-identifications, and bibliography for astronomical objects outside the solar system." Created by the Centre de Donn'es astronomiques de Strasbourg (CDS) in France, the website contains over three million objects, eight and a half million identifiers, one hundred thousand bibliographical references, and four million citations of objects...

The NASA Astrophysics Data System (ADS) Web site, which is hosted by the Harvard-Smithsonian Center for Astrophysics, is described as a Digital Library for Physics, Astrophysics, and Instrumentation. ADS maintains four bibliographic databases containing more than 3.2 million records that can be searched or browsed by various interfaces including a Journal/ Volume/ Page Service, Table of Contents...