Companies
| 1AU Astronomy Club - formed from the Alumni of Junior College Astro clubs all over Singapore. | |
| Amateur Astronomers Association of New York | |
| Amateur Observer's Society of New York | |
| Amherst Astronomy Association - free public programs, planetarium shows, solar and sunset observing, astronomy classes, and public and school outreach. | |
| Astronomical Society of Long Island (ASLI) | |
| Astronomical Society of South Australia - information about the society, its history and present day activities including dates of meetings and viewing nights. | |
| Astronomy Ireland - general interest Astronomy club and magazine with a distinctly Irish flavour. | |
| Auburn Astronomical Society - in central Alabama. | |
| Baltimore Astronomical Society - Founded 1881. Meets at Maryland Science Center in Balitimore second Tuesday of every month at 7:30 pm. | |
| Battle Point Astronomical Association | |
| Calumet Astronomical Society - constellation of the month, gallery, and virtual star party. | |
| Canberra Astronomical Society - sharing the wonders of the night sky with telescopes, guest speakers and much more. | |
| Central Valley Astronomers - astronomy club. | |
| Chapel Hill Astronomical and Observational Society | |
| Evansville Astronomical Society - we have something for everyone who loves the night sky. | |
| Fort Worth Astronomical Society - astronomy club with monthly indoor and outdoor, dark-site meetings. | |
| Houston Astronomical Society - Information about the society, its members, its observatory, and projects that the members participate in including CCD imaging, astrophotography and telescope making. | |
| Laramie Astronomical Society & Space Observers | |
| Miami Valley Astronomical Society - Dayton, OH | |
| Minnesota Astronomical Society - founded in 1972, promotes amateur astronomy and astronomy education. | |
| Muskegon Astronomical Society - Michigan - discussion forums, links to resources, member astrophotography and articles. | |
| Naperville Astronomical Association - astronomy club for southwest suburban Chicagoland. Free public meetings and stargazing from our observatory. | |
| National Centre for Astronomy - An unregistered and independent astronomy club. | |
| New Hampshire Astronomical Society - provides public viewing sessions and education. | |
| New Jersey Astronomical Association - dedicated to the education of anyone interested in the wonders of the night sky. | |
| New Mexico Tech Astronomy Club | |
| North Jersey Astronomical Group | |
| Nuernberger Astronomische Arbeitsgemeinschaft | |
| Penn State Astronomy Club | |
| Peoria Astronomical Society | |
| Riverside Astronomical Society - bringing the joys of astronomy to the public. | |
| Seattle Astronomical Society | |
| Shoreline Amateur Astronomical Association | |
| Sidewalk Astronomers San Francisco - devoted to the encouragement of public astronomy with tips, information, links. | |
| Smoky Mountain Astronomical Society - deep sky help and charts, and everything that is astronomical. | |
| Societe Astronomique de Liege (SAL) - conference, bibliotheque observation, bulletin mensuel . | |
| Society of Amateur Radio Astronomers | |
| Springfield Stars Club - public observing sessions at the Springfield Science Museum, Korkosz Award, Arunah Hill dark-sky observing. | |
| St. Louis Astronomical Society - educational material and information. | |
| UC Davis Astronomy Club | |
| University Lowbrow Astronomers - diverse group of amateur astronomers. | |
| University of Illinois Astronomical Society | |
| University of Michigan - Student Astronomical Society | |
| Western Kentucky Amatuer Astronomers | |
| Astromart - the global astronomy marketplace. | |
| Khan Scope Centre - new and used astronomical telescopes, accesories and binoculars. | |
| Kronia Communications - supports research in the field of planetary catastrophics by examining both current and past evidence in a variety of disciplines. | |
| Micro Luminetics, Inc. - Slow scan, chilled, digital CCD cameras. High resolution, scientific grade CCDs; 12 or 16 bits; -70 degree C cooling without liquids. | |
| Monoptec Corporation - offers the fixed shutter dome, an enabling technology in observatory enclosures and satellite laser ranging, for astronomy, defense, and satellite communications. | |
| Observa-Dome Laboratories, Inc. - manufacturer of observatory domes, missile tracking, and laser ranging shelters. | |
| Harvard - Astro 206 - Stellar Physics - studied from the two basic precepts - of the elementary (baryonic) building blocks in the Universe and the evolution of matter (nucleosynthesis). | |
| Nick Strobel's Astronomy Notes - notes for introductory astronomy course taught by Nick Strobel. | |
| University of Massachusetts, Amherst - Astronomy 225 - galactic and extragalactic astronomy. | |
| Earth View ECLIPSE Network - comprehensive source of educational information about the history, science, and observation of eclipses, especially total solar eclipses. | |
| Eclipse Information - Perth, Western Australia - predictions of solar and lunar eclipses that may be visible from Perth, Western Australia. | |
| Fred Espenak's Eclipse Page - maintained by NASA astronomer and eclipse forecaster Fred Espenak. Offering eclipse predictions, tips on observing and photographing eclipses and more. | |
| Discovery of a Planetary Orbit Around the Nearby Star 51Pegasi | |
| Extrasolar Research Corporation - information on the candidate protoplanet TMR-1C seen by the Hubble Space Telescope. | |
| Other Worlds, Distant Suns - catalog of extrasolar planets. | |
| Searching For Extrasolar Planets - project at San Francisco State University. | |
| FITS [nasa.gov] | |
| FITS archive at NRAO | |
| Direct Project - determining the distances to nearby galaxies. | |
| Milky Way System | |
| Milky Way, The | |
| Our Own Galaxy: | |
| Celestial Atlas (1826) - by Franz Niklaus König. | |
| Contributions of Women to the United States Naval Observatory: The Early Years | |
| Digital Archive of Historical Astronomy Pictures | |
| Japanese Starlore and Astronomical History | |
| Infrared Astronomy - everything cool about heat radiation from NASA's Infrared Astronomy Center. Discover the infrared universe through stunning pictures taken by very cold telescopes. | |
| Live From The Stratosphere - gives students a chance to (virtually) ride aboard NASA's Kuiper Airborne Observatory and observe planets, stars, and galaxies with an infrared telescope. | |
| WIRE: Wide-Field Infrared Explorer - will detect primarily galaxies with unusually high rates of star formation or "starburst" galaxies which emit most of their energy in the far-infrared. | |