Christoph Hormann wrote:

> Dan P wrote:
> 
>>> 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 values are between 0 and 1. If they were between 0 and two, the 
>> percentage would be half of what I said and so forth.
> 
> That's nonsense - in fact the albedo isn't even limited to [0..1] by 
> definition.  Anyway i am not really interested in convincing you from 
> using correct formulations if you don't want to, my arguments were clear 
> and easy to understand IMO, the rest is up to you.

You may be right. This is what I understand about albedo values:

0 = Reflects no light.
1 = Reflects all light.

An surface cannot reflect a negative amount of light.
An surface cannot reflect more light than is provided to it.

This understanding may be incorrect; I'm wrong a lot!
My ego is not invested in being right here -- for the good of the group, 
please set us straight, Christoph! (The last sentence is actually not 
being sarcastic).
-- 
Respectfully,
Dan P
http://<broken link>

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