Authors: Yongfeng Yang
Over thousands of years many people were commonly perplexed by a phenomenon that the Moon appears larger at the horizon than in the zenith. Here it is proposed that this may be ascribed to an unusual optical atmospheric effect. The thick spherical atmosphere forms a natural convex lens that lies between an Earthly observer and the Moon. Convex lens, which inherently has the function to converge light rays, may act as a magnifying glass. For the Moon at the horizon and the Moon in the zenith, the former encounters a larger enlargement from the atmospheric lens than the latter does.
Comments: 16 Pages. This version adds an experiment to test the theory.
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