Abstract
I HAVE seen with pleasure Mr. Heath's clear and instructive letter and diagrams on this subject in NATURE of March 2. Some fourteen years ago I calculated the altitudes of the sun required to produce the elliptic and other arcs, and obtained results in agreement with Mr. Heath's, except that I took 41° instead of 42° for the semi-angle of the cone.
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WHITMELL, C. Ground Rainbows. Nature 97, 34 (1916). https://doi.org/10.1038/097034a0
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DOI: https://doi.org/10.1038/097034a0
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