Optical phenomena in the glassy dome

Very bright sun dogs in Fargo, North Dakota. Also visible are parts of the 22° halo (the arcs passing through each sundog), a sun pillar (the vertical line) and the parhelic circle (the horizontal line). Cicero and the double sun A passage in Cicero‘s On the Republic (54–51 BC) is one of many by Greek and Roman authors who refer to sun dogs and similar phenomena: Be it so, said Tubero; and since you invite me to discussion, and present the opportunity, let us first[…]

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