Abstract
AT about noon on this day a fine halo with its mock suns was well seen at the Radcliffe Observatory. Measurements of the vertical radii of the first circle gave 22° 24′, whilst the angular distance between the true and mock suns was 22° 30′. The radius of the second circle was rather difficult to determine, but the mean of several measures gave 46° 40′. The inverted arcs at the vertices of the two circles were clearly seen. The zenith distance of the sun's centre was nearly 75° at the time of the observation.
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STONE, E. A Solar Halo. Nature 33, 222 (1886). https://doi.org/10.1038/033222a0
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DOI: https://doi.org/10.1038/033222a0
