This site is developed and maintained by John Walker, founder of Autodesk, Inc. and co-author of AutoCAD. A variety of documents, images, software for various machines, and interactive Web resources are available here; click on entries in the frame to the left to display a table of contents for that topic. Items which span more than one category are listed in all.On June 8th, 2004, a rare astronomical phenomenon not seen since 1882 will occur. The planet Venus transits the Sun, appearing as a black silhouette visible to the unaided eye (with suitable protection for safe solar viewing). Venus will take a little more than six hours to traverse the Sun's disc. The transit is visible from anywhere on Earth where the Sun is up while it's in progress; see the map for details, or consult detailed predictions for your location. For further information, visit Fred Espenak's 2004 Transit of Venus page. If you miss this one, there's another transit of Venus on June 6th, 2012, but after that you'll have to wait until December 11th, 2117 for the next!A comprehensive (and large) list of all items on the site is available as a frame- and graphics-free Site Map.
Except for a few clearly-marked exceptions, all the material on this site is in the public domain and may be used in any manner without permission, restriction, attribution, or compensation. Back links to this site are welcome.
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