Here are some astronomy links that we find useful.

• astronomyLINKS™ – A directory of astronomy links categorized by subject.
• Atmospheric Optics – A host of visual spectacles – rainbows, halos, glories, coronas and many more.
• Heavens-Above! – all the information you need to observe satellites such as the International Space Station and the Space Shuttle.
• Lunar and Planetary Science at the NSSDC – Planetary fact sheets and mission information.
• Skymaps.com – Downloadable monthly sky maps.
• Astronomy Magazine – The world’s best-selling astronomy magazine
• Sky&Telescope – Sky and Telescope Magazine – Site has some very useful interactive observing tools.
• SPACE.com — Something Amazing Every Day!
• SpaceWeather.com – News and information about the Sun-Earth environment.
• StarDate Online – Stargazing tips, almanac, constellation guide and more.
• Department Of Astronomy – The University of Wisconsin–Madison’s Department of Astronomy
• Sun, Planet, and Satellite Data – Introduction to the Solar System.
• The Nine Planets – Guide to the Solar System.
• Planetary Data System -NASA’s Planetary Data System
• Wisconsin Astronomy – Wisconsin astronomical events and organizations.
• Your Sky – Interactive planetarium program.