http://www.space.com/11038-china-suns-video-unexplained.html
"Optical refraction" (though allows it's a "darn rare one"--seem to be getting all kinds of "rare ones" of many types these days, huh?)
"Mirages" (though this one is atypical)
"Previous sightings of horizontally-aligned double images of the sun and moon are recorded in a book called "Light and Color in the Outdoors" (English edition: Springer 1993) by the famous Flemish astronomer Marcel Minnaert, which remains the most complete reference on double suns."
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