• Web Directory: The WWW-Virtual Library: Astronomy: Observatories
• Adam Mickiewicz University - Astronomical Observatory
• Air Force Maui Optical Station (AMOS) - part of the Maui Space Surveillance Site (MSSS) located at the summit of Haleakala.
• Andromeda Observatory
• Anglo-Australian Observatory (AAO) - includes a wide range of astronomical images.
• Antarctic Submillimeter Telescope and Remote Observatory - 1.7 m diameter submillimeter-wave telescope at the South Pole, open to proposals.
• Apache Point Observatory - located in the Sacramento Mountains in the Lincoln National Forest, 18 miles south of Cloudcroft, NM.
• Arecibo Observatory - the site of the world's largest single-dish radio telescope. Part of the National Astronomy and Ionosphere Center.
• Armagh Observatory
• Astronomical Institute and National Observatory of Athens
• Astronomy in Latvia
• Beijing Astronomical Observatory (BAO) - engaged in astrophysical research. The instruments of BAO are operated in Xinglong, Huairou and Miyun stations.
• Big Sky 2000 Project - an initiative by the Big Sky Astronomical Society to establish an astronomical observatory to support interactive astronomy-based observing projects for K-12 students.
• Black Forest Observatory - offers sky tours by private reservation and resources on BFO's educational space mission.
• Boyden Observatory - information from Friends of Boyden Observatory.
• Bureau des longitudes - Server dedicated mainly to the study of motion of solar system objects Ephemeris will be soon available on this server
• Burke-Gaffney Observatory - Public and teaching observatory at Saint Mary's University
• Calar Alto Observatory
• Caltech Submillimeter Observatory - a 10.4-meter single-dish submillimeter telescope on Mauna Kea, Hawaii operated by Caltech for the astronomical community under contract from the National Science Foundation.
• CCD Imaging Facility - astronomical imaging with a research Ritchie- Chretien telescope and CCD camera.
• Cecil and Ida Green Piñon Flat Observatory
• Chabot Space & Science Center (CSSC) - observatory, planetarium, exhibits, and natural park setting focusing on astronomy and the space sciences and the interrelationships of all sciences.
• Cloudbait Observatory - a robotic observatory under construction in Colorado.
• College of Staten Island Astrophysical Observatory - provides an overview of the observatory and research info on asteroids.
• Columbus Optical SETI Observatory - contains extensive documentation on the Optical Search for Extraterrestrial Intelligence (OSETI) and the activities of the observatory.
• Copenhagen University Observatory
• Copernicus Kintaro Observatory - We specialize in the dog star.
• Custer Institute and Observatory - amateur astronomy education center located on The North Fork of Long Island.
• Dark Sky Observatory - Appalachian State University's observatory, located in the Blue Ridge mountains of North Carolina.
• David Dunlap Observatory - database of galactic classical cepheids.
• Discovery Park Gov Aker Observatory - offers visitors an opportunity to explore the fascinating science of astronomy.
• Canadian Astronomy Data Centre - distribution center for observatory archives, catalogues, and more.
• Herzberg Institute of Astrophysics - scientific institute within the National Research Council of Canada which operates and administers astronomical observatories.
• HIA Public Education Pages - includes research, images, FAQ, and more.
• Dominion Astrophysical Observatory (DAO) - The Dominion Astrophysical Observatory is operated by the National Research Council of Canada (NRC) through its Herzberg Institute of Astrophysics (HIA) as a national centre for astronomical research within Canada, with emphasis on UV, optical and IR astronomy.
• Dominion Radio Astrophysical Observatory
• Dudley Observatory - private foundation supporting research and education in astronomy, astrophysics, and the history of astronomy.
• Dunsink Observatory
• Estacion Astronomica Rio Grande - Argentina
• Atacama Large Millimeter Array (ALMA) Project - merger of the major millimeter array projects: the European Large Southern Array (LSA), the U.S. Millimeter Array (MMA), and possibly the Japanese Large Millimeter and Submillimeter Array (LMSA).
• European Southern Observatory
• Science Archive Facility - European Southern Observatory (ESO) and Space Telescope - European Coordinating Facility (ST-ECF) Archive
• Florence and George Wise Observatory (Israel) - owned and operated by Tel-Aviv University.
• Fred Lawrence Whipple Gamma-Ray Observatory - primary emphasis of the research is the search for and study of celestial sources of very high energy (VHE) gamma-rays in the energy range of 100 GeV - 10 TeV.
• Fred Lawrence Whipple Observatory - located near Amado, Arizona on Mount Hopkins.
• Adaptive Optics
• Gemini Observatory - a multi-national effort to build twin 8.1 meter astronomical observatories atop Hawaii's Mauna Kea and Chile's Cerro Pachon
• Givatayim Observatory - devoted to reasearch and study in astronomy and science. Includes listing of upcoming talks.
• Grainger Observatory - Phillips Exeter Academy - information about classes, projects, and events for students and the community.
• Griffith Observatory
• Grove Creek Observatory - optical observatory run for the benefit of amateur and professional astronomers. Provides on-site share accommodation.
• Hill Observatory - description of construction steps for a back yard observatory.
• Japanese National Astronomical Observatory
• John C. Hook Memorial Observatory
• Keck Interferometer - proposal to form an interferometer from six telescopes to search for planets outside our solar system.
• Keck Observatory - Mauna Kea, Hawaii.
• Kitt Peak National Observatory
• Observatory Information
• 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.
• La Palma Observatory - part of the Isaac Newton Group of telescopes; site includes information on the island of La Palma.
• La Plata Observatory
• La Silla Observatory - located in the Chilean Andes. Houses a set of more than 15 astronomical instruments devoted to explore the southern sky.
• Lake Afton Public Observatory - Devoted to Astronomy education. Info about our public programs and resources for teachers (online Ask an Astronomer) can be found on our pages.
• Las Brisas Observatory - a private observatory located high in the Rocky Mountains. Includes Schmidt camera photographs of comets and nebula.
• Leiden Observatory - Leiden University (The Netherlands)
• Lester B. Pearson College Observatory
• Linden Observatory - information and background information.
• Lowell Observatory - particularly recognized for its work on the smaller solar system bodies.
• Lucile Miller Observatory - your gateway to the skies in the Catawba Valley in North Carolina. We welcome all groups and individuals.
• Lund Observatory
• Maidanak Foundation - supporting scientific teams currently running the Mt. Maidanak Observatory, and providing funding for key scientific equipment.
• Martz Astronomical Ass. & Observatory - containing information for beginning stargazers and on public events.
• Mauna Kea Observatories - large and powerful collection of telescopes.
• Caltech Submillimeter Observatory - a 10.4-meter single-dish submillimeter telescope on Mauna Kea, Hawaii operated by Caltech for the astronomical community under contract from the National Science Foundation.
• Canada-France-Hawaii Telescope - a 3.6 meter optical/infrared telescope located atop the summit of Mauna Kea.
• James Clerk Maxwell Telescope - 15-m diameter telescope designed specifically to operate in the sub-mm region of the spectrum.

• NASA Infrared Telescope Facility - a 3-meter infrared telescope located at an altitude of 14,000 feet on the summit of Mauna Kea in Hawaii.
• Submillimeter Array (SMA)
• UKIRT: United Kingdom InfraRed Telescope - the largest telescope in the world dedicated solely to observations at infrared wavelengths between 1 micron and 30 microns.
• University of Hawaii 2.2-meter Telescope
• Visitor Information Station - located at the 9,300 foot level of Mauna Kea. Provides visitor information, public summit telescope tours, and public stargazing programs.
• McCormick Observatory - information on Public Nights at and the history of the Leander J. McCormick Observatory and the Fan Mountain Observatory at the University of Virginia
• Millstone Hill Observatory
• MIT Haystack Observatory
• Monterey Institute for Research in Astronomy - non-profit astronomical observatory dedicated to research and education in astronomy.
• Mount Stromlo Abell Cluster Supernova Search - findings and papers.
• Mount Stromlo and Siding Spring Observatories
• Stromlo Exploratory - visitor's centre situated between the large telescope domes of the observatory, overlooking the Brindabella Ranges.
• 150-Foot Solar Tower at Mount Wilson Observatory

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• Mount Wilson Observatory - take a virtual tour and learn about the exciting cutting-edge science being done at this pioneering facility. Learn about astronomy and astrophysics through the observatory's educational resources.
• Mt Laguna Observatory - Mt Laguna Observatory, operated by San Diego State University, and located 40 miles east of San Diego at an elevation of over 1800 meters.
• Mt. Graham International Observatory (MGIO)
• Image Reduction and Analysis Facility - a general purpose software system from the National Optical Astronomy Observatories for the reduction and analysis of astronomical data
• National Optical Astronomy Observatories
• NOAO Optics and Coatings Labs (NOCL) - responsible for the fabrication, assembly, testing, and support of the optical instrumentation, telescopes, and systems for the National Optical Astronomy Observatories.
• 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.
• National Undergraduate Research Observatory - a consortium of primarily undergraduate institutions providing hands-on training and research experiences for undergraduate students.
• SuperNovae Key Project - information on SN 1995D, SN 1995F, and SN 1995G, including image gallery and undergraduate research experiences.

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• 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.
• NF/ Observatory - about the observatory, pictures, projects, and the observatory's 20-foot aeolian wind harp.
• NOAO 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.
• Norman Lockyer Observatory & Planetarium - historic astronomical observatory and planetarium operated by The Norman Lockyer Observatory Society.
• Observatoire de Haute-Provence (OHP) - Observing facilities at OHP (1m93, 1m52, 1m20 telescopes): manuals, schedules. Publications. User's Guide. Lettre de l'OHP.
• Observatoire de Lyon
• Observatories of the Carnegie Institution of Washington - main offices located in Pasadena, California, with observatories located in Chile and Palomar.
• Observatorio Astronomico Nacional de Colombia
• Observatorio Astronomico Nacional of Spain - operates optical and radio telescopes in Spain. Astronomers conduct research in star formation and evolution, ISM, galaxies, and VLBI.
• Observatory at University of Colorado at Colorado Springs - A small facility for research and teaching.
• Inter-Sol Programme (ISP) - international programme with the purpose of observing the daily sunspot activity.
• Paderborn Observatory - Volkssternwarte Paderborn e.V.
• Astronomy
• Caltech Computational Astronomy
• Caltech Observational Cosmology Group - designs novel instruments to study the Cosmic Microwave Background Radiation and other interstellar phenomena at infrared and millimeter wavelengths.
• Pulsar Group
• Space Radiation Laboratory
• Paris Observatory Server
• Parsonsburg Observatory - educational & amateur astronomy along the eastern shore of Maryland.
• Pieri Astronomy Observatory
• Puckett Observatory - specializes in photographing comets and deep sky objects. Also home of the Cometwatch program.

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• Rainwater Observatory and Planetarium - primarily focused on education for amateur astronomers, school science classes, or local community groups.
• Ritter Planetarium and Brooks Observatory - University of Toledo - offers several opportunities for the people of the Metro Toledo community to learn more about astronomy.
• Royal Greenwich Observatory
• Royal Observatory Of Belgium
• Royal Observatory, Edinburgh
• San Francisco Exploratorium Observatory
• SAO/TDC Smithsonian Astrophysical Observatory
• Slottsskogen Observatory
• Sonoma State University Observatory - Free Public Viewing Nights; Automated telescope with CCD imaging system and 14" telescope.
• South African Astronomical Observatory
• Southeastern Association for Research in Astronomy, The - SARA has recommissioned a 0.9-m telescope at Kitt Peak National Observatory near Tucson, Arizona for CCD imaging, photometry and polarimetry.
• Southern Sky Observatory
• Special Astrophysical Observatory, Russian Academy of Sciences (SAO RAS) - the country's main centre for ground-based space research, located in the South of Russia, in the Caucasus mountains of Karachaevo-Cherkesia.
• Steward Observatory - University of Arizona - undergraduate and graduate degrees in astronomy and astrophysics; major research facilities in observational and theoretical astronomy.
• Stockholm Observatory
• Centre de Données Aastronomiques - data center dedicated to the collection and worldwide distribution of astronomical data and related information.
• Strasbourg Astronomical Observatory
• Thueringer Landessternwarte Tautenburg
• Tololito Observatory - located at La Serena, Chile, and devoted to amateur astronomy.
• Tycho Brahe Observatory - in Swedish and English.
• U.S. Naval Observatory (USNO)

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• Santa Clara Valley Lighting and Lick Observatory - story of cooperation between Lick Observatory and nearby San Jose to cub light pollution.
• UCO/Lick Observatory
• UCO/Lick Observing Info - documents for Mount Hamilton users including technical manuals and descriptions of instruments, specifications of detectors, and schedules. There is also information on requesting time.
• University of Jena (Germany)- Astrophysical Institute & University Observatory
• University of Ljubljana, Slovenia - Astronomical Observatory
• McDonald Observatory
• ROKCAM Observing Manual - a near infrared imager developed for the 2.7m Harlan Smith telescope at the McDonald Observatory.
• UTC Clerence T. Jones Observatory - open to public Friday nights to observe.
• Van Vleck Observatory - Wesleyan University
• Vatican Observatory (Vatican City)
• VLBI Space Observatory Programme - a radio astronomy space mission.
• Volkssterrenwacht Mira (Mira public observatory), Grimbergen, Belgium - Visit the observatory with our virtual tour.
• Warren Rupp Observatory - one of the largest amateur operated telescopes.
• Western Observatorium
• Windowpane Observatory - names galaxies and searches for supernovae in them.
• Worth Hill Observatory - Worth Matravers, UK - privately owned observatory open to school parties and group visits.
• Yerkes Observatory

• Approximate Astronomical Positions - including co-ordinate conversion, position and circumstances of the moon, and positions of the planets. Approximate methods used.
• Derek's Planet Information - detailed information and photos of the nine planets.
• Exploring the Planets - a simulated research center at the National Air and Space Museum where you can explore these and many other mysteries of the Solar System.
• Gazetteer of Planetary Nomenclature
• GISS Institute on Climate and Planets - a collaboration between the Goddard Institute for Space Studies, CUNY, and NYC public schools providing students and faculty with opportunities in current NASA climate and planetary research.
• Arizona State University - Space Photography Laboratory (SPL)
• Ben-Gurion University of the Negev (Israel) - Earth and Planetary Image Facility
• Cornell University - Spacecraft Planetary Imaging Facility
• Lunar and Planetary Institute - Center for Information and Research Services
• NASA Regional Planetary Image Facility - directory of all facilities in this international system of planetary image libraries.
• National Air & Space Museum - Center for Earth and Planetary Studies
• University of Hawaii - Pacific Regional Planetary Data Center
• Washington University
• PDS Imaging Node - the curator of NASA's primary digital image collections from past, present, and future planetary missions.
• Planetary Data System (PDS) - archives and distribution of digital data from past and present NASA planetary missions, astronomical observations, and laboratory measurements.
• The Nine Planets  - a multimedia tour of the solar system with pictures, text, sound and references to other Net resources.
• O Sistema Solar - informacoes sobre os astros do sistema solar , sol, lua , planetas, cometas,asteroides e links sobre astronomia
• Origin of the Solar System, The - using a computer model to study the process of planetesimal accretion.
• Planetary Alignment in the Year 2000 - analysis of planetary alignment that occured on May 5, 2000, and the previously predicted consequences including the end of the world.
• Planetary Alignment of 5 May 2000 - brief description of the event from the National Space Science Data Center.
• Planetary Astronomy @ Caltech - includes descriptions of the research group's work, people, and activities.
• Planetary Fact Sheets
• Planetary Rings Node - responsible for restoring, archiving, and publishing datasets describing planetary ring systems. All of the relevant datasets aquired from previous and future spacecraft, as well as from Earth-based observatories.
• Planetary Science Research Discoveries - an educational site devoted to sharing the exciting discoveries being made in planetary science by NASA-sponsored researchers.
• Planets of the Solar System - links to planets and some pictures.
• Reaching for the Planets - planetary fact sheets.

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Mercury

• Mercury [NASA]
• Mercury [Nine Planets]
• MESSENGER: MErcury Surface, Space ENvironment, GEochemistry and Ranging - scientific mission to peel back the planet's veil of mystery.
• NSSDC Photo Gallery: Mercury

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Venus

• Ice On Venus? - is there "ice" on Venus? If so, what KIND of "ice" is it?
• Venus [asu.edu]
• Venus [NASA]
• Venus [Nine Planets]
• Venus Hypermap - dedicated to making some of the vast quantities of data provided by the Magellan satellite available in an intuitive and informative way.

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Earth

• Earth [nasa.gov]
• Earth [Nine Planets]
• Earth and Moon
• International Earth Rotation Service (IERS) - provides timely and accurate data on the Earth's orientation by maintaining key connections between astronomy, geodesy, and geophysics (in English and French).

• Mars Clickworkers Pilot Study  - volunteer to help NASA identify and categorize Martian craters in your web browser, in your free time.
• The Nine Planets: Mars 
• Canyons of Mars, From Silicone Dust Rivers? - personal hypothesis that the canyons of Mars may have been eroded by rivers of silicone dust made from silica reacted to an ancient methane atmosphere.
• Daily Martian Weather Report - martian atmospheric data. See how the climate of the red planet evolves from day to day and season to season.
• Evidence of Recent Groundwater Seepage and Surface Runoff on Mars - PDF files of the articles published in the journal Science.
• Exploring The Planets: Mars - a National Air and Space Museum exhibit.
• Mars - highlights features of the planet.
• Mars Global Surveyor Mars Orbiter Camera Images Suggest Recent Sources of Liquid Water on Mars - view the photographic evidence with interpretations.
• Mars Internet Mission - links, drawings, chat, and more.
• Mars Today - current conditions on Mars and the planet's relationship to Earth.
• Mars-Watch.com - news, interesting Martian facts, and a Mars photo archive.
• Mars: Mankind's Future Lies in Space - discusses human exploration, understanding, and possible colonization of Mars. Offers interactivities and a chat room.
• MarsNews.com - newswire for the new frontier - covering Mars missions, prospects of life, and Humans to Mars.
• NASA's Observatorium: Mars
• New Mars - a Journal of the Martian Frontier, offering news and perspectives.
• New Scientist: Mars - collection of articles which appeared in the magazine.
• Red Zone's Mars Page - with images, chatroom, forum, and more.
• What Happened to the Water on Mars? - a personal theory.
• World Book Encyclopedia: Mars: Exploring the Red Planet - learn all about the planet Mars, including efforts to explore the Martian atmosphere and surface, and prospects for sending humans to the planet.

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Jupiter

• Europa Landscapes from Galileo Images - shows the applications of shape-from-shading to the extraction of planetary surfaces.

• Galileo Countdown - provides the latest information about the upcoming orbit, as well as background information on the moon which Galileo will encounter on that orbit.
• Galileo Experiments and Data
• Galileo Flybys of the Earth and Moon
• Galileo Project Information - NASA mission to Jupiter.
• IoFlyby.com - science news and images of Jupiter's moon Io, from the Galileo mission and Science@NASA.
• Jupiter Millennium Flyby - on December 30, 2000, the Cassini spacecraft will pass by Jupiter en route to Saturn. At the same time, the Galileo spacecraft will be orbiting the giant planet as well.
• NASA Ames Research Center: Galileo Probe
• New Images - from the Galileo Solid State Imaging Team.
• NSSDC Photo Gallery: Ganymede - taken by the Galileo spacecraft during its first and second flybys of Jupiter's satellite Ganymede.
• Project Galileo: Bringing Jupiter to Earth - studying Jupiter and its moons, and returning a steady stream of images and scientific data.
• Scientific American: The Galileo Mission to Jupiter and Its Moons - article by the Galileo project scientist.
• Web Directory: Galileo Space Probe Information
• Jupiter [NASA]
• Jupiter [Nine Planets]
• Jupiter Events - gives central merdian transit times for theGreat Red Spot and has links to other Jupiter web sites and comet Shoemaker-Levy 9 impact images.
• Jupiter: The Giant Planet - introduction to the planet's composition and structure, circulation and atmosphere, satellites and rings, and more.
• World Book Encyclopedia: Jupiter: The Giant Planet - discover what scientists have learned about the largest planet in the solar system.
• NASA Ames Research Center: Galileo Probe
• New Images - from the Galileo Solid State Imaging Team.
• NSSDC Photo Gallery: Ganymede - taken by the Galileo spacecraft during its first and second flybys of Jupiter's satellite Ganymede.
• Project Galileo: Bringing Jupiter to Earth - studying Jupiter and its moons, and returning a steady stream of images and scientific data.
• Scientific American: The Galileo Mission to Jupiter and Its Moons - article by the Galileo project scientist.
• Web Directory: Galileo Space Probe Information
• Jupiter [NASA]
• Jupiter [Nine Planets]
• Jupiter Events - gives central merdian transit times for theGreat Red Spot and has links to other Jupiter web sites and comet Shoemaker-Levy 9 impact images.
• Jupiter: The Giant Planet - introduction to the planet's composition and structure, circulation and atmosphere, satellites and rings, and more.
• World Book Encyclopedia: Jupiter: The Giant Planet - discover what scientists have learned about the largest planet in the solar system.

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Saturn

• Cassini Huygens Probe
• Cassini Information
• Cassini Project at IRF-U - providing a spherical Langmuir probe for the measurement of the plasma density and temperature. Will also use other antennas on the spacecraft for the same purpose.
• Cassini Radar - the specific task of the Radar instrument will be to study Saturn's largest moon, Titan.
• Cassini: Debating the Risks - Florida Today Space Online Special Report providing an in-depth look at this historic adventure, controversial because of its power source, radioactive plutonium. Includes news stories, images, and movies.
• Cassini: Voyage to Saturn - significant events and mission status reports, plus more from NASA Jet Propulsion Laboratory.
• CNN: Journey to Saturn
• European Space Agency Huygens Probe to Titan - key facts, mission details, probe description, instruments, and more.
• Huygens Information - from the National Space Science Data Center.
• Huygens.com - collection of messages and signatures on CD-ROM flying to Titan onboard ESA's Huygens space probe.
• Jupiter Millennium Flyby - on December 30, 2000, the Cassini spacecraft will pass by Jupiter en route to Saturn. At the same time, the Galileo spacecraft will be orbiting the giant planet as well.
• Risks vs. Returns: Is the Cassini Mission Safe? - a PBS Online NewsHour Forum providing questions and answers.
• Support the Cassini Space Mission to Saturn - "choose knowledge, not fear."
• Saturn [NASA]
• Saturn [Nine Planets]
• Saturn Events - gives the times of the ring plane crossings and the times of satellite events such as eclipses and transits. The site also has links to images.
• Saturn's Ring System
• Sixth Planet from the Sun: Saturn - the planet, its rings, and its moons.

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Uranus

• Huge Storms Hit - if springtime on Earth were anything like it will be on Uranus, we would be experiencing waves of massive storms, each one covering the country from Kansas to New York, with temperatures of 300 degrees below zero.
• Solar Views: Uranus - includes statistics, information on Uranus' rings, photographs, and a moon summary.
• The Planets: Uranus - facts and images.
• Uranus - guide to the seventh planet from the Sun, including facts, myth and culture, image archives, and news.
• Uranus [NASA]
• Uranus [Nine Planets]
• Uranus by Alyce - history of the blue planet, as well as a quiz.

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Neptune

• Neptune [NASA]
• Neptune [Nine Planets]
• NSSDC Photo Gallery: Neptune

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Pluto

• National Space Science Data Center: Pluto
• NSSDC Photo Gallery: Pluto
• Pluto
• Pluto Home Page - the first planetary web page to be mentioned in a song by Christine Lavin.
• Pluto Profile
• Pluto, the Ninth Planet - cold and dark, but still a great vacation spot.
• Web Directory: Pluto WWW Pages - a great collection of links.

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Scale Models

• Build a Solar System
• Eugene, Oregon Scale Model Solar System - one : one billion. Includes teaching the solar system, and our place in the universe.
• World's Largest Model of the Solar System - photographic tour of model planets in the world's largest true-to-scale (size and distance on same scale) model solar system.