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• n  the angle that a line makes with a line perpendicular to the surface at the point of incidence

• angle of incidence

News & Articles

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• Chang'e Lunar Rover Landing Site Viewed By NASA's Lunar Reconnaissance Orbiter
  NASA Chang'e 3 landed on the moon's Mare Imbrium (Sea of Rains), on Dec. 14, 2013. The LROC instrument aboard NASA's Lunar Reconnaissance Orbiter has now imaged the Chinese lander and rover three times: Dec. 25, 2013 (M1142582775R), Jan. 21, 2014 (M1144936321L), and Feb. 17, 2014 (M1147290066R). From month-to-month the solar incidence angle decreased steadily from 77 degrees to 45 degrees ...
  March 5, 2014 - redOrbit