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"William C. Keel" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > Chris L Peterson <[EMAIL PROTECTED]> wrote: > Interesting tidbit that came up from a colleague around here - the large > albedo difference between Earth and Moon cancels out (in the mean) if we > compare the surface brightnesses of earthlit Moon and moonlit Earth, since > in both cases what enters is the product of both albedos. Earthshine > is brighter than moonlight is here by essentially the ratio of fractions > of the sky covered by Moon and Earth, as seen from each other. > Are you sure? I'd have thought that the earthlit Moon would be easily brighter than the moonlit Earth. Reason being that the earth has a higher albedo than the moon and also is much larger; so both in terms of size and reflectivity it beats the moon hands down. Or have I missed the point of your colleague's observation?
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