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The Search for Longitude
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Trimble - All About GPS
Trimble, a company that manufactures GPS, offers an excellent online tutorial on how GPS works.

Stephen Wolfram
This is the homepage of Stephen Wolfram, one of the contributors to "Today's Great Challenge."

Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time
by Dava Sobel
Walker and Company, 1995

The Quest for Longitude
edited by William J. H. Andrewes
The Proceedings of the Longitude Symposium Harvard University, Cambridge, MA Nov 4-6, 1993

The Global Positioning System and GIS
by Michael Kennedy
Ann Arbor Press Inc., 1996

A Comprehensive Guide to Land Navigation with GPS
by Noel J. Hotchkiss
Alexis Publishing, 1997

Special Thanks
Harvard Graduate School of Education students Julia Goldrosen, Tobey Jackson, Mona Zeftel and Ken Zimmerman

William J.H. Andrewes, Curator, Harvard University Collection of Historical Scientific Instruments
Kelly Beatty, Sky and Telescope Magazine
Craig Evans
Molly Frey, WGBH Interactive
Dr. Tom Herring, M.I.T.
Adgio Hutchings/RIO MUSIC
Magellan Systems Corporation
Dr. Francine Vannicola, U.S. Naval Observatory

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Kim Ducharme, Designer
Karen Hartley, Hot Science Developer
Cassie Mere Johnson, Intern
Brenden Kootsey, Production Technologist
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Jennifer Uscher, Production Assistant

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