Abstract
MR. R. T. OMOND, of the Ben Nevis Observatory, in NATURE of February 24, p. 391, asks whether the cause of the green colour at sunset at sea is the sun shining through the water? This cannot be the cause, for I have many times observed this colour at sunrise behind the mountains Madonie or Copo Zaferano, which, from the Observatory, appear higher on the sea horizon than the sun's disk. That is to say, the phenomenon occurs when, for the observer, the sun is entirely above the marine horizon, and no part of the disk can shine through the water.
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RICCÒ, A. Green Light at Sunrise and Sunset. Nature 35, 584 (1887). https://doi.org/10.1038/035584d0
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DOI: https://doi.org/10.1038/035584d0
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