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Astronomy Reference Sources
Academic Press Dictionary of Science and Technology
Complete, up-to-date definitions for use by practicing scientists and professionals in all scientific fields.
Dictionary of Astronomy
A comprehensive dictionary, covering all aspects of astronomy.
Eric Weisstein's World of Physics
Online astrophysics encyclopedia, including definitions, illustrations and formulae.
Astronomy Databases
Web of Knowledge
Science Citation Index 1900 -- present. Part of the ISI Web of Knowledge for finding highly cited articles on your topic.
Applied Science and Technology Index
Indexes journals from 1983 to present in the fields of astronomy, chemistry, computer technology, engineering, mathematics, and physics.
Academic OneFile (formerly ArticleFinder)
Find journal articles, including some full-text online, from 1980 to present.
Scirus
A web crawler "for scientific information only."
Astronomy Web Resources
arXiv.org e-Print archive
ArXiv is an e-print service in the fields of physics, mathematics, non-linear science, and computer science, including thousands of submitted research papers in astrophysics.
Astronomy Picture of the Day
Each day a different image or photograph is featured, along with a brief explanation written by a professional astronomer.
Bruce Medalist winners
Biographies of scientists, professional and amateur, recognized for advancing the science of astronomy.
Astronomy Net
John Huggins web site includes news, articles, forums, pictures, and other resources online.
Science.gov
Astronomy and Space web links and federal government documents online.
ISR Catalog

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Electronic Astronomy Journals
Astronomy E-journals
Online journals in astronomy, astrophysics, and space science.
JSTOR
Journal archive including historic titles in science and technology.
Astronomy Magazine
Popular magazine makes some of its content, including articles and pictures, available online.
Sky and Telescope
Popular astronomy magazine makes news and "how to" articles on observational astronomy available online.
Astronomy Organizations
American Astronomical Society
Professional society sponsoring meetings and publications.
Royal Astronomical Society
Professional organization of the United Kingdom.
International Astronomical Union
Worldwide astronomical organization.