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Note that, strictly speaking, the geometric albedo is only defined
for objects that are flat, at least on the spatial scale at which measurements are acquired (the angle of incidence is undefined or quite variable for non-flat objects), and
for direct beam illumination (by definition diffuse illumination impinges on a surface from a variety of incidence angles).
A) The concept arises primarily because it is useful, I would say.
In principle the problem for a non-flat object is that you don't know where exactly (at which distance from the light source) to place the flat disk; and strictly speaking maybe it shouldn't be flat, but cut out of a sphere centered at the light source. The article now states that the disk should have the "same cross-section"; if you mean - in the case of a perfect ball or sphere - a disk with the same diameter, then the disk will look smaller if it is placed at a distance so that the centers of the ball and the disk coincide. However, the differences in the albedo caused by this would be negligible for most astronomical purposes.
Icek (
talk)
21:41, 25 March 2011 (UTC)reply
Geometric albedo value for Venus changed from 0.84 to 0.65.
[User::Sigi_E|Sigi_E]] 16:, 9 November 2009 (UTC+1) 25
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