Abstract
WILL you permit me to say a few words on the interesting question raised by Dr. Ingleby in your last? The sun, moon and all the heavenly bodies appear set, as it were, in the blue sky when the weather is clear; and as they are rarely visible unless when surrounded by at least a small space of blue sky, it seems to me that they will be naturally judged to be at the same distance from us that the sky is. But what is this distance? What, in other words, is the mean distance from which the blue light diffused or reflected from the air or vapour comes to us? Prof. Tyndall, who has devoted much attention to the causes of this blue appearance, may perhaps be able to tell us. The problem, of course, is rather an indefinite one, but an approximate solution might assist us in determining the question.
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MONCK, W. The Moon's Diameter. Nature 1, 606 (1870). https://doi.org/10.1038/001606b0
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DOI: https://doi.org/10.1038/001606b0
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