Abstract
OF the parhelia of January 27 seen by M. Albert Riggerbach (NATURE, vol. xxv. p. 364) I was a spectator, and noted my observations at once. I was walking near Pavia when I observed the phenomenon about 3.45. A mock sun (one only) was in the same altitude with the sun on the horizon; M. Riggenbach's faint cirrus obviously corresponds to the filamenti nebbiosi in my note; they were as I well remember, with the mock sun in the eastern part of the sky, while in the opposite region some blackish cumuli approached slowly.
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PORRO, F. Parhelia. Nature 25, 437 (1882). https://doi.org/10.1038/025437c0
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DOI: https://doi.org/10.1038/025437c0
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