Abstract
This paper describes an unusual halo observed on the morning of 19 January 1787 from Caspe, Spain. The most striking characteristic of this phenomenon was a vertical tail of light that appears under one of the false suns.
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Obregón, M.A., Fernández-Fernández, M.I. & Sáenz, G. Unusual halo display recorded at Caspe (Spain) in 1787. Acta Geod. Geoph. Hung 45, 471–475 (2010). https://doi.org/10.1556/AGeod.45.2010.4.6
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DOI: https://doi.org/10.1556/AGeod.45.2010.4.6