For November 15, 2007: In Find Your Longitude, a NOVA Online Adventure game from PBS, your students can find out why having a precise timepiece—a chronometer—helps determine your longitude. The game provides information about John Harrison and how he solved the navigation problem of sailing the open seas. Compare the challenges of the 1700s to the challenges of today. Read what scientists believe are our greatest challenges. Set sail and find your longitude as you travel the seas.

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