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| (52) Nam, ut demonstratum est in theorematibus mathematicis, necesse est circumferentiam regularem spere a superficie plana sive sperica, qualem oportet esse superficiem aque, emergere semper cum orizonte circulari. | (52) for as is demonstrated in mathematical theorems, the regular surface of a sphere must always necessarily emerge from a plane or spherical surface (as the surface of water must be) with a circular horizon. |