The Reconnaissance Portugal, it is said recently, had a great impact upon the normal science in the Renaissance Europe. It is true that the Portuguese navigators, especially Duarte Pacheco Pereira (c.1460-1534) and Joao de Castro (1500-1548), had taken the ancient authorities down easily for some matters of Cosmography through their own maritime experiences. But they could not break away from the Aristotelian Paradigm, however faultfinding they might be.