Abstract
ATTEMPTS have been made by Clausius and various other mathematicians to calculate the light at different points of the perfectly clear sky, and to compare the light of the whole (or a portion) of the sky with that of the sun. The difficulties of photometric measurement have prevented any of the theories being thoroughly established by experimental verifications.
References
"Photometric Observations of the Sun and Sky," by Wm. Brennand Proceedings of the Royal Society, vol. 49, n. 288, April 18, 1891, pp. 255–280.
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Photometric Observations of the Sun and Sky1. Nature 46, 284–286 (1892). https://doi.org/10.1038/046284a0
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DOI: https://doi.org/10.1038/046284a0
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