Dan P wrote:
> [...]
> 
> Try substituting the word "brighter" with "more bright" and it may sound 
> more clear.

Earth is neither 21% brighter nor 21% more bright than moon assuming the 
given albedo values.  If you want to give percentual values you have to 
do it correctly, otherwise simply say the albedo of earth is 0.21 higher 
than that of earth (which of course isn't a very useful information).

The whole thing is probably a bit confusing because the unit of albedo 
is 1 (it is a ratio between two values of the same unit.  If you have 
two people, one 1,60m tall and one 1,90m you also would not say one is 
30% taller/more tall than the other...

Christoph

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