Every few years, a full moon coincides with the point in the satellite's elliptical orbit that brings it closest to the center of the Earth. Friday night, the moon will be fully illuminated just four hours after reaching that point, according to a feature story on the National Aeronautics and Space Administration's Web site.
The moon will appear up to 14 percent larger and 30 percent brighter than "lesser full moons we've seen earlier in 2008," NASA says -- provided it is being viewed in a clear sky.
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