• Bob Yen's Eclipse Photography
• 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.
• Eclipse On-Line - maps, figures, and tables for eclipses that will occur in the near future.
• Eric's Black Sun Eclipse Website - information about future eclipses and eclipse accounts, presentations, and photos.
• 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.
• High Moon - solar and lunar eclipses of the past and future, by a shadow chaser.
• MrEclipse.com - the ultimate resource for eclipse photography, featuring eclipse photo galleries and reports, by Fred Espenak.
• Nicholas' Eclipse Page - about various types of eclipse and how they happen. Also instuctions and a template for an eclipse viewer.
• Sky & Telescope's Eclipse Page - information about some recent and upcoming eclipses of the Sun and Moon.

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Lunar

• Astronomy On-Line: Lunar Eclipses - reports on the total lunar eclipses of September 27, 1996 and September 16, 1997.
• Eclipse of the Harvest Moon - September 27, 1996.
• Five Millennium Catalog of Lunar Eclipses - predictions for all 12,186 lunar eclipses occurring during the five thousand year interval 2000 B.C. to 3000 A.D..
• Lunar Eclipse Observer - features lunar eclipse analyses, images, and animations, and moon topography and observation.
• U.S. Naval Observatory Lunar Eclipse Computer - provides the local time of each eclipse "event" for recent and upcoming lunar eclipses for any location.

• Advanced Fiber-Optic Echelle (AFOE) - spectrograph designed specifically to perform precise stellar radial velocity measurements, and optimized for asteroseismology and extra-solar planet detection. Includes details of a multiple planetary system around the star Upsilon Andromedae.
• Darwin - a candidate European infrared interferometer in space for characterizing the planetary systems orbiting nearby stars by direct imaging and spectroscopy.
• Exoplanets - discoveries of worlds orbiting other stars.
• Exploring New Worlds - from Science News.
• Extrasolar Planets Encyclopaedia - excellent site for those after the facts. In English and French.
• Extrasolar Research Corporation - information on the candidate protoplanet TMR-1C seen by the Hubble Space Telescope.
• Extrasolar Visions - provides hard data and speculation about extrasolar planets.
• Giant Planets Orbiting Faraway Stars - article by Geoffrey W. Marcy and R. Paul Butler discussing how extrasolar planets are detected, planetary comparisons, and the future of planet hunting.
• Keck Interferometer - proposal to form an interferometer from six telescopes to search for planets outside our solar system.
• Kepler Mission - proposed mission designed to discover and characterize hundreds of Earth-size planets using a spacebased photometer.
• Microlensing Planet Search Project (MPS) - searches for evidence of extra-solar planets using the gravitational microlensing technique.
• Other Worlds, Distant Suns - catalog of extrasolar planets.
• Planetary Systems and Their Changing Theories
• Pulsar Planets Page - PSR 1257+12 is a billion year old neutron star orbited by 3 or more planets. Learn more about this first extrasolar planetary system on the pulsar planets page.
• Scientific American: A Parade of New Planets - astronomers are sighting new planets circling distant stars.
• Search for the Extrasolar Planets: A Brief History of the Search, the Findings and the Future Implications
• Transits of Extrasolar Planets Network (TEP) - utilizing the transit method, based on the observation of a star's small drop in brightness, that occurs when the orbit of one of the star's planets passes in front of it.

• Arp's Catalog of Peculiar Galaxies - Comprehensive tabulation of Dr. Halton C. Arp's list of peculiar galaxies with supporting material for amateur astronomers.
• Classifying Galaxies - interactive lesson on the Hubble system of classifying galaxies for grades 5-9.
• Direct Project - determining the distances to nearby galaxies.
• Galaxy Catalog, The - a collection of digital images of nearby galaxies.
• Scientific American: Galaxies Behind the Milky Way - over a fifth of the universe is hidden from view, blocked by dust and stars in the disk of our galaxy. But over the past few years, astronomers have found ways to peek through the murk.

• Canadian Galactic Plane Survey - an international effort to map the interstellar matter in a large swath of our own Milky Way Galaxy at high resolution.
• Journey through the Galaxy - information on stars, planets, nebula, and many other interesting things that are contained in this cluster of stars that we call The Milky Way.
• Milky Way Galaxy, The
• Milky Way System

• Milky Way, The
• Multiwavelength Milky Way - images of the sky near the Galactic plane in spectral lines and continuum bands spanning a frequency range of more than 14 orders of magnitude.

• Our Own Galaxy: The Milky Way
• Shape of the Milky Way

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Small Magellanic Cloud

• Small Magellanic Cloud, The  - covering what is known about the galaxy, and observations of objects within the galaxy. Provides information to help observe the SMC, including maps, atlases, and history.
• Anglo-Australian Observatory: The Small Magellanic Cloud - information on the second nearest galaxy to the Milky Way.
• Gruppo Astrofili Vincentini: The Small Magellanic Cloud - illustration and observations from LaSilla, Chile.
• Magellanic Cloud Picture Collection - the Magellanic Clouds at different wavelengths.
• Messier Catalog: The Small Magellanic Cloud, SMC

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Pictures

• CCD Images of Galaxies
• Galaxy Catalog, The - collection of 113 galaxies assembled at Princeton University Observatory by Zsolt Frei during his thesis work.
• UA Astronomy's Collection of Galaxy Pairs - and interacting galaxies images.

• Adler Planetarium & Astronomy Museum - interprets the exploration of the Universe for the broadest possible audience and hosts one of the finest collections of early astronomical instruments in the world.
• Adler Sky Eye - interactive view of the Chicago skyline from Adler Planetarium.
• Astrolabe, The - provides photographs, diagrams, and the history of the astrolabe, an instrument used by early astronomers for solving problems relating to time and the position of the stars.
• Brief History of Astronomy - in timeline format.
• 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
• Discovery of the Perseid Meteors - article from Sky & Telescope magazine on Edward C. Herrick's discovery of the Perseids in 1837.
• Documents of Astronomical History - excerpts from the writings of philosophers, astronomers, and scientists.
• History of High-Energy Astrophysics - a list of many important dates in the history of high-energy astrophysics and astronomy in general, with links to further details.
• Japanese Starlore and Astronomical History
• Native American Star Knowledge
• Out of This World - exhibition of rare historical celestial atlases.
• Physics and Astronomy People and Discoveries - biographies and narratives from A Science Odyssey.
• Shapley - Curtis Debate in 1920 - guide to understanding all facets of the Great Debate between Harlow Shapley and Heber D. Curtis over the scale of the universe. Includes a complete transcript.
• Web Directory: Astronomiae Historia/History of Astronomy

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Archaeoastronomy

• Aeon: A Journal Of Myth & Science - Aeon regularly features articles on archaeoastronomy and solar system studies.
• Ancient Egyptians and the Constellations - a look at ancient relics showing that Egyptians mapped the constellations.
• Archaeoastronomy Pages - collection of papers by James Q. Jacobs.
• Astronomy Sites in Asuka - information about astronomy among ancient tombs and relics, including Takamatsu Zuka Kofun burial tomb.
• Center for Archaeoastronomy - advances research, education and public awareness of archaeoastronomy.
• FS 301 - Ancient Astronomy in Africa - University of Texas at Austin - course was developed with the primary goal of unveiling information pertaining to monoliths in Africa, primarily those that were astronomically oriented.
• Institute for Interdisciplinary Sciences - discusses palaeoastronomy and archaeoastronomy studies all over the world.
• Intijalsu - details the activities and interests of a group of Chilean amateur archaeoastronomers.
• Sacred Landscape, The - essays on archaeoastronomy and sacred geometry.
• Search for Planet X - chronicles the modern astronomers' search for the tenth planet as compared to that of the Sumerians.
• Star Tales and Archaeoastronomy - an annotated bibliography.
• Stone Wheels and Dawn Stars Rising - details the astronomical significance of the Bighorn Medicine Wheel.
• VCSU's Medicine Wheel

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Megaliths

• Ancient Places - information and pictures of Scottish and Cornish sites.
• Ancient Stones of Scotland - guide to ancient Scottish monuments with photographs, maps, panoramic movies, glossary, and an extensive bibliography.
• Arthur Franco and The Megaliths of Hy-Brazil - anthropology, history and philosophy joined in the search of our ancient roots.
• Derbyshire Stone Circles - a complete listing of Derbyshire's stone circles with photos, links, and other information.
• Dolmen Path: Russian Megalithic Site - provides information about Russian dolmens and other megaliths, include maps, a gallery, and legends.
• Dolmens in Denmark - photographs of Danish megaliths.
• Heathen Monuments - legends about ancient alters, graves, megaliths, mounds, runestones and other such monuments.
• Meath Passage Tombs - offers details of Knowth, Newgrange, Dowth, Fourknocks, Loughcrew, and Tara, the 4000 to 5000 year old Megalithic Passage Tomb Monuments.
• Megalith Map, The - resource for finding any stone circle or stone row in England, Ireland, Scotland, or Wales.
• Megalith Site - about standing stones, stone circles, and megaliths, including a clickable map of locations.
• Megalithic Monuments of Meath - portal site to the 4000 to 5000 year old megalithic monuments and passage chamber tombs on the east coast of Ireland.
• Megalithic Mysteries - photographic guide to many British stone circles, megaliths and picturesque sites.
• Megalithic Stone Circles - there's more here than just Stonehenge. This site serves as an introduction to megalithic monuments with information on other circles located in Scotland, Ireland, Wales and Brittany.
• Megalithica - gazetteer of ancient monuments and sites in the United Kingdom. With a special focus on southern Wales and a section of Sheela Na Gigs.
• Megaliths in Western Europe
• Recumbent Stone Circles in North East Scotland
• Stone Pages - presents a comprehensive guide to Europe's stone circles, dolmens, standing stones, cairns, barrows and hillforts.
• Stoned- Website of the Seriously Retro - list and review of stone circles and other related prehistoric monuments around the U.K.
• Archaeometry and Stonehenge - technical details and results.
• Build Your Own Stonehenge - explicit directions on how to build your own miniature Stonehenge based on N,S,E,W positioning. Observe the solstice or equinox in style.
• Complete Stonehenge, The - photos, links, poems, maps, and more.
• GORP: Beyond Stonehenge - guide to the megalithic structures, like Stonehenge, to be found along the British countryside, including Avebury, Ridgeway Path, Dartmoor and Scotland's Islands and more.
• Millennium Stone - recreating the transportation of a bluestone from Preseli, Pembrokeshire to Stonehenge.
• Mystic Places: Stonehenge - Discovery Channel Canada visits this massive and mysterious construction.
• Save Stonehenge - examines Stonehenge conservation issues.
• Stonehenge - What were its ancient uses?
• Stonehenge - More Than Just a Stone Circle - info, legends, links, and more.
• Stonehenge Barrows as a Starmap - suggesting that the megaliths map the zodiacal constellations.
• Stonehenge Campaign - organization that wants free access to the site to celebrate solstices and equinoxes.
• Virtual Calanais - journey to the fringes of the Outer Hebrides to walk among the mysterious Callanish Stones.

• Albuquerque Astronomical Society - non-profit corporation for amateur and professional astronomers, holding monthly meetings, and frequent star parties for members and the public.
• Amateur Telescope Makers Association (ATMA) - members receive the ATM Journal.
• American Association of Amateur Astronomers - observing awards, quarterly newsletter and membership in the Astronomical League.
• American Association of Variable Star Observers (AAVSO) - both amateur and professional.
• Association of Universities for Research in Astronomy (AURA) - serves the entire astronomical community by providing modern, major facilities to qualified scientists from all universities.
• Astronomical Association of Northern California - group of Northern California astronomy clubs banded together to promote astronomy and space science through conferences and communication.
• Astronomical Society of Singapore, The - up-to-date details on sky events, photos, and feature articles about the heavens.
• Astronomical Society of the Pacific - non-profit, educational organization.
• Astronomy In The Carolinas
• Bolingbrook Illinois Astronomy Club - find links to various astronomical sites, local observations and local club information. Everyone welcome.
• British Astronomical Association: Campaign for Dark Skies (CfDS) - find out more about the CfDS, what is being done in the UK, and what you can do to help save our precious skies from light pollution.
• Centro de Estudos Astronomicos de Alagoas - CEAAL is an association of astronomy from Brazil. See our astronomical journal.
• Custer Institute and Observatory - amateur astronomy education center located on The North Fork of Long Island.
• Czech Astronomy Society - Events, links, articles from leading Czech and foreign magazines.
• Danish Astronomical Society - Denmark's nationwide organisation for amateur astronomers.
• Gay, Lesbian and Bisexual Members of the Astronomical Community (GLBASTRO) - forum for support and networking between lesbian, bisexual, gay, transsexual, etc. members of the astronomical community.
• International Astronomical Union (IAU) - promotes and safeguards the science of astronomy in all its aspects through international cooperation. The sole internationally recognised authority for assigning designations to celestial bodies and surface features on such bodies.
• International Dark-Sky Association - non-profit membership-based organization that aims stop the adverse environmental impact of light pollution and space debris.
• Jordanian Astronomical Society (JAS)
• Leicester University Astronomy Society - guides to the night sky: galaxies, clusters, nebulae, stars and planets. Tour the observatories, telescopes, events, the month-by-month calendar and ask an astronomer.
• Los Angeles Astronomical Society

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• Medina County Astronomical Society - nonprofit organization founded to promote the advancement of amateur astronomy.
• Minnesota Astronomical Society - founded in 1972, promotes amateur astronomy and astronomy education.
• National Academy of Sciences Board on Physics and Astronomy
• Oil Region Astronomical Society
• Planetary Studies Foundation - non-profit sponsoring educational astronomy programs in Palatine, IL. Links to astronomy articles and tutorials online.
• Royal Astronomical Society - publishes journals, awards medals, fellowships and prizes. Houses one of the most comprehensive libraries and archives in the world.
• Royal Astronomical Society of New Zealand - professional and amateur astronomers in New Zealand and Australia.
• Sidewalk Astronomers - non-profit organization dedicated to bring Astronomy to the public.
• SPACE (Peruvian Astronomy) - founded in 1982, promotes astronomy (research, teaching, divulgation) in Peru.
• Texas Astronomical Society of Dallas
• UT Austin - Astronomy Students' Association
• Von Braun Astronomial Society
• Warren Astronomical Society - general info, members, upcoming events and more.