- European Southern Observatory (ESO) (3)
- Chinese Academy of Sciences - National Astronomical Observatories
 - Engaged in astrophysical research. The instruments of BAO are operated in Xinglong, Huairou and Miyun stations. - U.S. Naval Observatory (USNO)@
- Mount Wilson Observatory (3)
- National Optical Astronomy Observatory (3)
- Griffith Observatory@
- Japanese National Astronomical Observatory
- Gemini Observatory (1)
- Lowell Observatory (1)
 Anglo-Australian Observatory (AAO)
- Includes a wide range of astronomical images.- Chabot Space and Science Center (CSSC)
- Observatory, planetarium, exhibits, and natural park setting focusing on astronomy and the space sciences and the interrelationships of all sciences.
- Observatoire de Paris
- University of California Observatories/Lick Observatory@
- Mauna Kea Observatories (10)
- NEAT: Near-Earth Asteroid Tracking
- Project to autonomously search for near-Earth and Earth-crossing asteroids using a computer controlled telescope, a CCD camera, and NEAT software.
- Royal Observatory, Edinburgh
- Strasbourg Astronomical Observatory (2)
- Queen's University - Sudbury Neutrino Observatory (SNO)
- Heavy-water Cherenkov detector that is designed to detect neutrinos produced by fusion reactions in the sun.
- W.M. Keck Observatory (2)
- Isaac Newton Group of Telescopes
- Includes information on the island of La Palma.
- Cerro Tololo Interamerican Observatory
- Located about 500km north of Santiago, Chile, about 70km east of La Serena, at an altitude of 2200 meters. On site are six optical telescopes, and one radio telescope.
- Russian Academy of Sciences (SAO RAS) - Special Astrophysical Observatory
- The country's main centre for ground-based space research, located in the South of Russia, in the Caucasus mountains of Karachaevo-Cherkesia.
- Apache Point Observatory
- Located in the Sacramento Mountains in the Lincoln National Forest, 18 miles south of Cloudcroft, NM.
- University of Texas at Austin - McDonald Observatory@
- University of Arizona - Steward Observatory@
- Armagh Observatory
- Observatoire de Haute-Provence (OHP)
- Observing facilities at OHP (1m93, 1m52, 1m20 telescopes): manuals, schedules. Publications. User's Guide. Lettre de l'OHP.
- South African Astronomical Observatory
- Southern African Large Telescope (SALT)
- Official site for the largest telescope in the Southern hemisphere. Provides news and information, as well as a webcam offering views of the telescope's construction.
- Institut de Mécanique Céleste et de Calcul des Ephémérides and Bureau des Longitudes
- Dedicated to the celestial mechanics, dynamics, and astrometry of the objects of the Solar System.
- Columbus Optical SETI Observatory
- Contains extensive documentation on the Optical Search for Extraterrestrial Intelligence (OSETI) and the activities of the observatory.
- Observatorio Astronomico Nacional of Spain
- Operates optical and radio telescopes in Spain. Astronomers conduct research in star formation and evolution, ISM, galaxies, and VLBI.
- La Silla Observatory
- Located in the Chilean Andes. Houses a set of more than 15 astronomical instruments devoted to explore the southern sky.
- Observatories of the Carnegie Institution of Washington
- Main offices located in Pasadena, California, with observatories located in Chile and Palomar.
- Puckett Observatory
- Specialises in photographing comets and deep sky objects. Also home of the Cometwatch programme.
- Tel-Aviv University - Florence and George Wise Observatory
- Thueringer Landessternwarte Tautenburg
- Freidrich-Schiller-University Jena - Astrophysical Institute and University Observatory
- Lund University Observatory
- San Diego State University - Mt Laguna Observatory
- Located 40 miles east of San Diego at an elevation of over 1800 meters.
- University of Copenhagen - Astronomical Observatory
- Leiden University - Leiden Observatory
- ISAS - Institute of Space and Astronautical Science - VLBI Space Observatory Programme
- A radio astronomy space mission.
- Grove Creek Observatory
- Optical observatory run for the benefit of amateur and professional astronomers. Provides on-site share accommodation.
- University of Arizona - Mt. Graham International Observatory (MGIO)
- Royal Observatory of Belgium
- Features information on departments, projects, and international centres.
- Astronomy with a Neutrino Telescope and Abyss Environmental Research (ANTARES)@
- Antarctic Muon and Neutrino Detector Array (AMANDA) II Project@
- Observatory Science Centre, The
- Hands-on science centre in Herstmonceux, Sussex, U.K.
- Kopernik Space Education Center
- Operating observatory open to the public. Hands-on science classes are offered to K-12 students as well as to adults.
- Centre de Recherche Astronomique de Lyon
- Cincinnati Observatory Center@
- Dudley Observatory
- Private foundation supporting research and education in astronomy, astrophysics, and the history of astronomy.
- Stockholm University Observatory@
- Discovery Park Gov Aker Observatory@
- Institute of Astronomy and Astrophysics and National Observatory of Athens
- Custer Institute and Observatory
- Amateur astronomy education centre located on The North Fork of Long Island.
- Kitt Peak National Observatory (2)
- University of Toledo - Ritter Planetarium and Brooks Observatory
- Offers several opportunities for the people of the Metro Toledo community to learn more about astronomy.
- Black Forest Observatory
- Offers sky tours by private reservation and resources on BFO's educational space mission.
- Monterey Institute for Research in Astronomy
- Nonprofit astronomical observatory dedicated to research and education in astronomy.
- Las Brisas Observatory
- A private observatory located high in the Rocky Mountains. Includes Schmidt camera photographs of comets and nebula.
- Large Millimeter Telescope
- Provides an overview of the Mexico-based project dedicated to picking up electromagnetic radiation known as millimeter waves.
- University of Toronto - David Dunlap Observatory
- Database of galactic classical cepheids.
- Cloudbait Observatory
- A robotic observatory under construction in Colorado.
- Windowpane Observatory
- Names galaxies and searches for supernovae in them.
- Paderborn Observatory@
- Fremont Peak Observatory
- Offering interpretive astronomy, viewing, and educational programmes to the public from April through October. Members may operate the 30" Challenger telescope.
- University of Michigan - Detroit Observatory
- Offers a window to the 19th century when this observatory on the Michigan frontier provided an accurate time service, determined local longitude, and made astronomical discoveries.
- Northern Arizona University - National Undergraduate Research Observatory@
- Robert Ferguson Observatory
- Monthly star parties, public solar and night sky viewing with a 24" reflector, an 8" refractor, a 14" CCD computer controlled telescope and camera, and a 40" project by a team of volunteers, located in Sugar Loaf Ridge State Park.
- Super-Kamiokande Detector@
- Vatican Observatory
- Florida Institute of Technology - Southeastern Association for Research in Astronomy
- SARA has recommissioned a 0.9-m telescope at Kitt Peak National Observatory near Tucson, Arizona for CCD imaging, photometry and polarimetry.
- University of Chicago - Yerkes Observatory
- Harvard-Smithsonian Center for Astrophysics
- Cecil and Ida Green Piñon Flat Observatory
- College of Staten Island Astrophysical Observatory
- Provides an overview of the observatory and research info on asteroids.
- National Public Observatory
- Project set to begin in 2007, the goal of which is to make quality astronomical observing at a dark sky site affordable to everyone.
- California Institute of Technology - Submillimeter Observatory
- 10.4-meter single-dish submillimeter telescope on Mauna Kea, Hawaii, operated for the astronomical community under contract from the National Science Foundation.
- Fairborn Observatory
- Automatic telescopes in the Patagonia Mountains near Washington Camp, Arizona.
- University of Helsinki Observatory
- Conducting high energy astrophysics, interstellar medium, star formation, and planetary research.
- Antarctic Submillimeter Telescope and Remote Observatory
- 1.7 m diameter submillimeter-wave telescope at the South Pole, open to proposals.
- Universidad Nacional de Colombia - Observatorio Astronomico Nacional
- University of Ljubljana - Astronomical Observatory
- Norman Lockyer Observatory & Planetarium
- Historic astronomical observatory and planetarium operated by The Norman Lockyer Observatory Society.
- UKIRT: United Kingdom InfraRed Telescope
- The world's largest telescope dedicated solely to observations at infrared wavelengths.
- University of Pittsburgh - Allegheny Observatory
- Extra-solar planet detection and characterization of planetary systems is their primary reserch focus.
- Andromeda Observatory, The
- Provides information on various projects carried out at the obervatory.
- Wichita State University - Lake Afton Public Observatory
- Devoted to Astronomy education. Info about public programmes and resources for teachers.
- San Francisco Exploratorium Observatory
- Provides an insight of the observatory at the San Francisco Exploratorium with a guide to the the astronomy resources on the Exploratorium.
- California Institute of Technology - Palomar Observatory@
- University of Tennessee at Chattanooga - Clerence T. Jones Observatory
- Open to public Friday nights to observe.
- Calar Alto Observatory
- Australian National University (ANU) - Mount Stromlo and Siding Spring Observatories
- Visitor's centre situated between the large telescope domes of the observatory, overlooking the Brindabella Ranges.
- St. Mary's University - Burke-Gaffney Observatory
- Public and teaching observatory.
- Appalachian State University - Dark Sky Observatory
- Located in the Blue Ridge mountains of North Carolina.
- University of Virginia Observatories
- Information on Public Nights and history.
- Maiden High School - Lucile Miller Observatory
- Gateway to the skies in the Catawba Valley in North Carolina, welcoming all groups and individuals.
- Pieri Astronomy Observatory
- Dominion Astrophysical Observatory@
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