American Astrophysical Society

AstroWeb : Astronomy/Astrophysics on the internet

European Southern Observatory

Instituto de Astrofísica de Canarias (IAC)

Observatorio Astronómico Nacional (OAN)

Physics societies and space agencies all over the world (University of McGill)

Astronomy page by Einet Galaxy

Resources guide on Astronomy

Astronomy and Astrophysics Web site of the WWW Virtual Library 

SERTS (Solar Extreme-Ultraviolet Rocket Telescope and Spectrograph) 

Astronomy resources by Martindale's Graduate and Undergraduate Center 

MT Wilson Observatory

NASA National Aeronautics & Space Administration

Royal Astronomical Society

Biblioteca del Observatorio de Paris (Monographs, periodical publications, preprints, etc.)

Institut d'Astrophysique Spatiale (IAS)

Institut d'Astrophysique de Paris (IAP)

Institut National de Sciences de l'Universe du CNRS (INSU/SDU)

Observatorio de Paris-Meudon-NanÇay

Planetario de Madrid

Metereology

Meteorology site on Einet Galaxy 

Metereology resources 

InfoMet (University of Barcelona )  Fundació Catalana per a la Recerca

Instituto Nacional de Meteorología (Spain)