Abstract
WHILE on a short stay at St. Moritz I was much struck by the peculiar colour of the sky on the evening of December 10. It had been threatening snow most of the day, and a few flakes fell during the afternoon, the sky being overcast. At about 3.30 p.m. to 4 p.m. the sky cleared over the mountains towards the east, and revealed, instead of the usual blue, a fairly large expanse of vivid emerald green. None of us had ever seen it before, so that we all stopped. I should be much pleased if any of the readers of NATURE could give me some idea of the cause of this unusual phenomenon.
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NOBLE, J. Emerald Green Sky Colour. Nature 75, 199 (1906). https://doi.org/10.1038/075199e0
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DOI: https://doi.org/10.1038/075199e0
