Dan P wrote:
> 
> What you are describing is called the "albedo" of an object. This 
> website[1] defines albedo as, "the fraction of light that is reflected 
> by a body or surface." This site contains some albedos that illustrate 
> your point:
> 
> (higher = brighter)
> Venus: 0.76
> Earth: 0.33
>  Moon: 0.12
> 
> The Earth is 21% brighter than the moon (as you've said), probably 
> because of all the water on the surface and in the clouds. Venus is 43% 
> brighter [...]

What?

I don't know where you learned math but this can't be meant seriously.

If earth reflects a fraction of 0.33 of the incoming light and the moon 
0.12 that means the earth surface reflects 2.75 times the amount of 
light the moon surface reflects per surface area.  I don't even want to 
try to imagine how you came to '21% brighter'...

Christoph

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