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Computational biophysicist, et al. Only personal opinions.
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A me mi piace l'itagliano

https://en.wikipedia.org/wiki/Circumzenithal_arc

The circumzenithal arc, also called the circumzenith arc (CZA), the upside-down rainbow, and the Bravais arc, is an optical phenomenon similar in appearance to a rainbow, but belonging to the family of halos arising from refraction of sunlight through ice crystals, generally in cirrus or cirrostratus clouds, rather than from raindrops.

Circumzenithal arc - Wikipedia

Tratto da "Futura" n.5 gennaio 1984
Carlo Dradi per FN