Geometric Albedo of Earth 

The normal, reflective or geometric albedo is a measure of a surface's relative brightness when illuminated by solar light and with the observations being made vertically above the surface of the planet. The visual geometric albedo refers to the geometric albedo quantity when accounting for only electromagnetic radiation in the visible spectrum. The geometric albedo P_n of a point on a surface is the ratio of the normally observed radiance to that of the Lambertian surface.

The normal, reflective or geometric albedo is a measure of a surface's relative brightness when illuminated by solar light and with the observations being made vertically above the surface of the planet. The visual geometric albedo refers to the geometric albedo quantity when accounting for only electromagnetic radiation in the visible spectrum. The geometric albedo P_n of a point on a surface is the ratio of the normally observed radiance to that of the Lambertian surface.