Associated Press
This undated handout photo provided by the Smithsonian shows a sextant used by Apollo astronauts to navigate the moon. In the age of hand-held GPS devices, navigating by the stars may seem quaint and irrelevant. So it may come as a surprise that it took hundreds of years to develop the tools needed to find our way across oceans, through the air and into deep space. On Friday, the Smithsonian's National Air and Space Museum is opening its first major exhibition: “Time and Navigation: The Untold Story of Getting from Here to There.” It shows the evolution of marine, air and space navigation, as well as a glimpse of the future with one of the first robotic-driven cars. (AP Photo/Eric Long, Smithsonian)

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