Today, astronomical databases once available only at the largest university libraries are but a mouse click away on the Internet. Except for a few very large catalogs described in Chapter 3, virtually any astronomical data can be downloaded from public-access websites. In addition, astronomical software has become more advanced and easier to use. Although it is not possible to give a complete listing of important astronomy software and Internet sites in this appendix, we have been careful to select those that should be most useful. While we cannot guarantee that all the websites listed below will remain active while this textbook remains in print, we have checked that they were active as of August 2005.
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