Twinned Sundog?
Imaged over Vienna by Jonathan Shock (jonstraveladventures).   
©Jonathan Shock
These ‘twins’ are part of the same relatively tall sundog produced by plate crystals wobbling a degree or so from their normal horizontal alignment. We would see the full extent of the ‘dog’ if the crystal bearing clouds were continuous. As it is the two separate clouds separately light up to show sections of the sundog. Sundogs appear in many shapes and guises.
Atmospheric
Optics

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