Astronomy Links
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Observing the sky tonight

What's going on?

Reference

Solar System

Agencies and Societies
In addition to the list below, some of the best web astronomy links can be found at the Griffith Observatory Star Awards site.

Observing the sky tonight
What's in the sky at the moment?
Find out what to look for tonight, courtesy of Sky & Telescope Magazine
The night sky (electronic Telegraph)
Monthly description of the sky, with some useful links
Heavens Above
Want to see some satellites, or perhaps the space shuttle?  This remarkable site tells you when and where to look from any location on Earth.  Click here for satellites you can see tonight from Glasgow, and here for the MIR space station

What's going on?
Current Astronomical news
Get the latest from Sky & Telescope
SpaceViews Newsletter
The on-line newsletter of space exploration, with detailed reports on the progress of spacecraft
Space Calendar (JPL)
An incredible compilation of events to look out for throughout the year.  Well maintained, and with excellent links
Today @ NASA
NASA press releases
Astronomy Picture of the Day
Each day a different image or photograph is featured, along with a brief explanation  written by a professional astronomer

Reference
Astronomical Dictionary
from the Goddard Space Flight Center
The course textbook (Astronomy Today)
News and updates on the book, together with images and animations.
AstroWeb
An excellent compilation of astronomy resources in the internet
Space Shuttle Reference Manual
Mirror, signal, manoeuvre ...
Eric's Treasure Trove of Astronomy
An online encyclopaedia of astronomy
Messier Catalogue
For those deep-sky objects
The Web Nebula
Information on some famous objects
Astrophysics calculator
A virtual calculator with astrophysics buttons.  Remember to use SI units (not cgs)!
Handbook of Space, Astronomy and Astrophysics
Zombeck's extensive research handbook.  Lots of facts and figures online

Solar System
Planetary Surfaces Lab
An interactive compilation of planetary data
Nasa's planetary photojournal
Planetary data and images, including serveral good links to other planet sites
Solar images
The Sun, right now, at several wavelengths
The Earth from Space
Astronaut travel snaps

Agencies and Societies
Royal Astronomical Society (RAS)
International Astronomical Union (IAU)
Institute of Physics (IOP)
The Planetary Society
The British Astronomical Association
British National Space Centre (BNSC)
NASA homepage
European Space Agency (ESA)
Jet Propulsion Laboratory (JPL)
Goddard Space Flight Center (GSFC)