There are a wealth of online references for the amateur astronomer. Here are a few to get you started.
Astronomy and Astrophysics in the New Millennium The Messier Catalog Jarnac Comet Survey The Interactive NGC Catalog Online NJ Night Sky Plans for Building a Dobsonian Telescope SBIG Astronomical Instruments The Solar System in Pictures Space Physics Textbook The STScI Digitized Sky Survey The Two Micron All Sky Survey at IPAC Universe Today Wunderground Interactive Sky Chart
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