The geometric albedo of an astronomical body is the ratio of its actual brightness at zero phase angle (i.e. as seen from the light source) to that of an idealized flat, fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section. Diffuse scattering implies that radiation is reflected isotropically with no memory of the ...
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http://en.wikipedia.org/wiki/Geometric_albedo
is the ratio of the brightness of an astronomical body at a phase angle of zero to an idealized flat, fully reflecting, diffusively scattering (Lambertian) disk with the same cross-section. It is a measure of how much of the incoming illumination is being scattered back toward an observer and has a value between zero and one.
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http://en.wikipedia.org/wiki/Glossary_of_astronomy
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