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Although we no longer believe that celestial spheres surround the Earth, that’s still a handy concept for programs that let you use a smartphone to view a virtual world. Such a program needs to determine its orientation in 3D space, and Charles Petzold explains how to accomplish this using the horizontal coordinate system.

Read the article online: http://msdn.microsoft.com/magazine/jj553520
Last edited Jul 25 2012 at 6:26 PM  by KSharkey, version 2
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