Called a Wegener blank strip event , where sunlight gets cut off due to extra long atmospheric "ducts" some spanning more than 1000 kilometers, similar to fiber optics, but consists of more or less flat steep inversion layers. Some ducts are shorter in length and funnel whatever object or photons there is at the beginning , at the other end of its "fiber optic " air duct tunnel. Named for and theorized by Alfred Wegener, the same scientist who proposed tectonic plates science. The atmosphere is not necessarily stratified in straight layers. This is a great complexity which computer models can't duplicate with ease. Atmospheric refraction is very much similar to Black hole optics, is equally nearly identical in appearance with Einstein;'s gravitational lensing. Refraction techniques are also used to find dark matter. Horizon refraction on Earth is not very well understood and may help explain refraction cousins found everywhere in the universe. WD April 11, 2019
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