Katie Cordrey
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 Google’s World Sunlight Map Shows Where Its Day and Night Published: Jul 6, 09 Comments: 1 Views: 1,530 Map-lovers can now enjoy the play of sunlight around the world with Google’s World Sunlight map. The maps can be displayed on users’ computers or shared with others. Google’s World Sunlight Map gadget can be added to individual web pages or Google’s personalized home page. Viewers can choose from Mercator, Peters, Mollweide or equirectangular projection maps. Cloud data is updated every three hours to provide a real-time view of the planet’s changing image.  While less impressive than actually being into orbit, this is much more accessible to most of us.
I start with cloudless images of the earth during the day (from a pair of NASA satellites) and night (from a DoD program to map city lights). Every 3 hours, I download a composite cloud image based on data from weather satellites all over the world. And every half hour, these images are composited and mapped onto a sphere by xplanet according to the relative position of the sun.
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