Some interesting links

Version française

This page gives some links to sites devoted to:

as well as miscellaneous sites.

Most of these sites contain numerous links
to other sites dealing with similar subjects.




The very latest SOHO images
The SOHO spacecraft, located at 1.5 million km from Earth, continuously observe the Sun and send us images of it every day.  Other daily solar images, from several ground-based solar observatories, from the Yohkoh and TRACE satellites (Transition Region and Coronal Explorer) are available at the SOHO Synoptic Database.

The Solar Cycle
Every 11 years, the Sun undergoes a period of important activity; the last solar maximum was in mid-2000, but the Sun is still very active.

Exposé sur le soleil of the club Astronomie de l'Ecole Centrale Paris.

Solar observing FAQ by Jeff Medkeff
More than 130 questions (and answers :-) ) about solar observing.

Stanford solar center
This site contains a ton of stuff on the Sun, including games and activities, lots of pictures, a glossary of Sun related terms, and more.



If you want to know more about comets:
Exposé sur les comètes at the club Astronomie de l'Ecole Centrale Paris
Comets at the site Views of the Solar System

Information about the currently visible comets:
Seiichi Yoshida's Home Page or Encke Comet Observation Home Page or International Astronomical Union.

NASA-JPL Comet Hale-Bopp Home Page
Huge collection of comet Hale-Bopp images (more than 5000 images).

ESO homepage for the comet Hale-Bopp
General information, summaries and updates; also a lot of links to other comet Hale-Bopp websites.

Asteroid and Comet Impact Hazards
This site collect all the information concerning the possible impact of an asteroid or a comet on Earth (for example the "Earth-grazing" asteroids, like Toutatis which crosses the Earth orbit every 4 years; the Tunguska cataclysm, in Siberia and in 1908; the dinosaurs extinction, 65 million years ago...)

Comet Shoemaker-Levy 9 collision with Jupiter: at SEDS or at JPL.

Planetary probes and astronomical satellites

Hubble Space Telescope public images
Last results from the Hubble Space Telescope.  The impressive images come with a detailed description.  An index allows to retrieve previously released images.

NEAR (Near Earth Asteroid Rendezvous)
After paying a short visit to the asteroid Mathilde in June 1997, NEAR became in February 2000 the first spacecraft to orbit an asteroid.  After having photographed and studied intensively Eros during one year, it successfully landed on the asteroid on February 12, 2001.
Mars Odyssey, Mars Global Surveyor, Pathfinder and other NASA missions to Mars.
A rover and orbiters sent to explore Mars.

Extensive collection of images and data from Jupiter and his satellites, from the Galileo spacecraft, orbiting the planet since December 1995.

This satellite (SOlar and Heliospheric Observatory) observes the Sun since December 1995 and gives impressive images of our star.

Launched in October 1997, Cassini will reach Saturn on July 1, 2004, drop the Huygens probe in Titan atmosphere and observe the ringed planet for at least 4 years.  On its journey to Saturn, it made a flyby of the giant planet Jupiter on December 30, 2000.

ESA space missions in progress


Practical astronomy


  • SKYLINK, the server of the French-speaking amateur astronomers, provides ephemerides containing, among other things, interesting conjunctions, twilight length, planets visibility, Jupiter and Saturn satellites phenomena, actual comets, ...

  • Bureau des Longitudes ephemerides, very detailed and accurate (positions, rises and sets of solar system bodies, eclipses, starfield maps, ...).

  • AstroArts, in Japan, gives monthly ephemerides (click on "calendar") as well as planets rises and sets.  Note the times are given in JST = UT+9.

  • Astroweb, site devoted to amateur astronomy : monthly ephemerides, information about solar system, constellations, ...

  • Ephemerides of Guillaume Cannat, at Space News International.

  • The Space Calendar covers space-related activities and anniversaries for the coming year. Included are over 1100 links to related home pages. This Calendar is compiled and maintained by Ron Baalke (JPL).

  • Ephemerides and orbital elements for currently-observable comets and minor planets, at the Central Bureau for Astronomical Telegrams (IAU).

Solar and lunar eclipses

Sky maps

  • Hawaiian Astronomical Society Deepsky Atlas : myth, maps to magnitude 10, interesting objects description and images, sorted by constellations.  See also the lists of Messier objects and other objects, with localization maps.

  • Another constellations atlas, at the Munich Astro Archive.

  • The Starfield Map Server of the Bureau des Longitudes (France), creates sky maps à la carte (magnitude limit 16).

  • The Digitized Sky Survey of the STScI, also accessible at ESO, produces detailed pictures (magnitude limit ~ 20) of a region of the sky, extracted from the Palomar Sky Survey (northern hemisphere) or the Southern Sky Survey (southern hemisphere).  Given a celestial object name (stars, Messier and NGC objects, ...), this site also returns its coordinates.

  • SkyView offers the same services, but in all wavelengths domains (radio, infrared, visible, ultraviolet, X-rays, gamma rays).

  • Moon observation: Moon map at the ARVAL observatory or at Astroweb; photographic atlas of lunar craters and seas by António Cidadão.


Artificial Earth satellites ephemerides

Astronomical news

Astronomy software

Images and educational resources

Hubble Space Telescope public images

Astronomy Picture of the Day (APOD)
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
Previous pictures are archived and sorted by subject.

TWAN (The World At Night)
A collection of stunning photographs of the world’s landmarks against the celestial attractions.

National Optical Astronomy Observatory image gallery

Anglo-Australian Observatory Astronomical Images

Joe Orman's Photo Pages
Photography and Astronomy meet, in the middle ground between Art and Science.

Bill Arnett's Web Sites
Lots of images and information !  For example: the Nine Planets (a tour of the solar system), the Web Nebulae (spectacular images of the nicest nebulae), the Messier Deep-Sky Catalog, the World's Largest Optical Telescopes, etc...

Views of the Solar System
Another staggering tour of the solar system, to learn everything about planets and their satellites.

Welcome to the Planets
A collection of the best images from NASA's planetary exploration program.

Views of Our Solar System
A list of websites that offer images of solar system bodies.

Project Apollo Archive
An extensive collection of high-quality Apollo images.

NASA JSC Digital Image Collection
A collection of more than 9000 photos of the NASA manned space program, from Mercury to the Shuttle missions.

PDS Map-A-Planet
This site allows you to get an image map of any area on the Moon, Venus, Mars, Callisto, Europa or Ganymede, at a variety of zoom factors, image sizes, and map projections. These images are created using data from NASA planetary missions.

At Space News, a detailed description of the solar system (in French).

Bad Astronomy
The Bad Astronomy web pages are devoted to airing out myths and misconceptions in astronomy and related topics. Examples : astrology = garbage; the Apollo Moon hoax; why the Moon looks bigger on the horizon; water spins down a drain one way in the Northern hemisphere and the other way in the Southern hemisphere; science fiction movies: what is science and what is fiction...


Light pollution

A major problem in astronomy, light pollution is rapidly increasing and becomes a more and more annoying nuisance as well as a huge waste of energy.  Most people of the next century could wonder at a starry sky only in planetariums!  More and more associations are created to try to improve the nighttime environment.

International Dark-Sky Association (information sheets, numerous links).

Cliff Haas site : very rich site, with hundreds of links about light pollution.

Ciel Noir, light pollution discussion list (French).

L'ANPCEN : National Association for the Night Sky and Environment Protection (France).

L'ASCEN : Association for the Night Sky and Environment Protection (Belgium).

The Czech Republic is one of the first country to adopt a law preventing light pollution.

In Italy, the Lombardy Region also adopted a good law to fight the light pollution.

Numerous others links concerning light pollution can be found on the light pollution pages.



Astronomiae Historia
History of Astronomy.

Société Astronomique de Liège
Astronomical news, lectures, images of amateurs...



Road-maps and itineraries:

Geoportal of the Walloon Region : complete mapping of Wallonia, which contains information like elevation, aerial views, fauna and flora, old maps (Ferraris), flood areas, Natura 2000, geological map, RAVEL network...

OpenStreetMap, an openly licensed map of the world being created by volunteers using local knowledge, GPS tracks and donated sources.

Generate the panorama exactly like you enjoyed it during your holiday: the site draws and identifies all the summits visible on the horizon and indicates their distance.

Space imagery

Earth pictures

Volcano world
Lots of information about volcanoes around the world: currently erupting volcanoes, volcanoes on Earth and on other worlds, pictures, movies, games, and much more!
The World Factbook (CIA)
Did you know that Kingdom of Tonga is located in Polynesia and include 170 islands ?  That 2 princes govern Principality of Andorra : the president of France and Spanish bishop of Seo de Urgell ?  That Ethiopia is the oldest independent country in Africa and one of the oldest in the world - at least 2000 years ?  That Belgium holds 42 airports and 137 876 km of highways ?
You will find all this information at this site, as well as tons of other, concerning ALL countries.

The International Data Base (U.S. Census Bureau)
Data bank containing statistical tables of demographic, and socio-economic data for all countries of the world (for example population pyramids).

Tourism offices of all countries of the world



Royal Meteorological Institute of Belgium
Observations in Belgium, in Europe or in the world, climatology, textual forecast or graphical forecast, last satellite images: METEOSAT (Europe) or NOAA (Belgium), precipitations or lightnings, thickness of the ozone layer at Uccle.

7-day forecast for Belgium (Soil Service of Belgium)

Animations of precipitations over Benelux during the last hour or the last 24 hours.

Météo France
Forecast; satellite pictures of the last 24 hours; meteorology from A to Z.

4-day forecast for Brussels or elsewhere (Intellicast).

Weather satellites images all over the world (METEOSAT, NOAA, GOES, ...).

Last NOAA and METEOSAT pictures and archives of Europe (Wokingham).

Last METEOSAT picture of Europe: in the infrared or in the visible light (Nottingham).

Last NOAA pictures of Europe (Oberpfaffenhofen).

MPEG animations of the last METEOSAT images (GKSS).

Weather in Europe
Maps, forecast, satellite pictures : hundreds of links ! 6000 weather links for Europe !

Phénomènes météo
Rainbows, polar lights, sky colors, depressions and anticyclones, El Niño, St. Elmo's fire, cold and warm fronts, halos, parhelia, clouds, thunder-storms, hurricanes, precipitations, atmospheric pressure, green flash, tornados, ...

Weather Photographs (M. Bath et J. Deguara, Sydney, Australia)
Hundreds of pictures of clouds, lightnings, sunsets, rainbows, halos, tornadoes,...  Lots of weather links.



To find a shareware on Internet: Tucows or  Games: at or or
Free stuff on the Net : Le or
Sick of advertising invading Internet ?  Webwasher is a browser add-on (for Windows systems) that accelerates the navigation on the Web by removing advertising on Web pages while you surf, filtering pop-up windows, animated images, etc...
To explore the Web: Google is the best and the fastest tool.  AltaVista works too, as well as Yahoo or Lycos.
To search an E-mail address: Yahoo! People Search or Who Where.
To submit your website to 18 search engines: Add Me
A search engine dedicated to Liège: more than 1000 sites referenced.
Infobel: phone numbers in Belgium or in the World (white pages and yellow pages).
Belgian Golden Pages (ITT Promedia).
Belgian railways or European railways timetables or subway systems in various cities around the world.
La médiathèque de Belgique.
Internet in Belgium: Webwatch or AdValvas.
The Universal Currency Converter allows you to perform interactive foreign exchange rate conversion.
Geonome: geographic distribution of family names in Belgium.
Belgian news: Le Soir, La Meuse, La Libre Belgique, La Dernière Heure / Les Sports, La Nouvelle Gazette, RTBF, RTL
International news: CNN, Euronews, Le Monde
COMFM : thousands of live radios, hundreds of live TV, thousands of webcams !

Worldwide webcams:

If you like hiking or mountain-biking, go and discover the most beautiful places in the Meuse-Ardenne-Eifel area: more than 1000 km of trails are described in details (with maps and places of interest).

Impressions fugitives
Splendid photographs of Wallonia.  Every day, a new picture.
Web pages in Walloon language:


  • Your dictionary: links to more than 1800 dictionaries for over 250 different languages (from Afrikaans to Esperanto to Mapudungun to Swahili to Yiddish) !
    In particular, see online translators and multilingual dictionaries.
    On the same site, links to grammars and language courses, for over 100 languages.
  • Babel Fish, the AltaVista translation service: translates your own text or Web page (English, French, German, Italian, Portuguese, Spanish, Russian, Japanese, Korean, Chinese).
  • Free Translation: another online translation service (English, French, German, Italian, Portuguese, Spanish, Norwegian).
  • Eurodicautom : dictionary maintained by the European Commission, specialized in the technical terminology (agriculture, telecommunications, transport, legislation, finance); contains terms in the 12 official languages of the European Community.
  • Belgicisms: particularities of the French language spoken in Belgium.
  • Swiss French dictionary: particularities of the French language spoken in Switzerland.
  • A French dictionary for crossword puzzles.

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Homepage of GDOM (Groupe de Découverte et de Défense de l'Ourthe Moyenne)

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Last updated: 2 October 2016 by Philippe Demoulin