• International Astronomical Union
• American Astronomical Society
• Astronomical Society of Australia
• Astronomical Society of Japan
• Astronomical Society of the Pacific
• The Royal Astronomical Society (UK)
• Astronomical Society of Southern Africa
• Indian Association for General Relativity and Gravitation

Archives of pictures and images

• Astronomy Picture of the Day
• Hubble Space Telescope News
• Constellations page
• The Planets

Leading Astronomy Magazines

• Astronomy Magazine
• Sky Publishing
• The Astronomer On Line

On-line Astronomy Journals

• IAU Circulars
• Minor Planet Electronic Circulars
• Astronomy and Astrophysics
• Astronomical Journal
• Astrophysical Journal
• New Astronomy
• Journal of Astrophysics and Astronomy
  
• SolarNews
  

Preprints, Abstracts, Catalogs

• Astro-ph e-print archive
• NASA Astrophysics Data System

Web Pages of Astronomy Institutes in India

• Indian Institute of Astrophysics, Bangalore
• Indian Institute of Science, Bangalore
• Inter-University Centre for Astronomy and Astrophysics, Pune
• National Centre for Radio Astrophysics, Pune
• Physical Research Laboratory, Ahmedabad
• Raman Research Institute, Bangalore
• S. N. Bose Institute, Calcutta
• Tata Institute of Fundamental Research, Mumbai
• Harish-Chandra Research Institute, Allahabad
• Aryabhatta Research Institute of Observational Sciences, Nainital