Canas, António Costa (Author)
Cahiers François Viète Center for Epistemology and History of Science and Technology (CFV)
Issue: 3
Pages: 15-36
This paper is about the evolution of astronomical navigation in Portugal, in the Age of Discoveries. We will focus our attention on the contributions, by the Portuguese mariners, to the determination of latitude at sea, using Polaris or the Sun. Besides the longitude issue has a solution only in the second half of 18th century, the Portuguese sailors intended a method to obtain this geographical coordinate, appealing to the conjunctions and oppositions of the Moon. This method was used in Magellan’s voyage (1519-1522). In this paper, we will try to present these efforts made by the Portuguese, that allowed them to face the vast oceanic waves with some degree of confidence.
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