Aspects of this topic are discussed in the following places at Britannica.
...in the Low Countries, who was also a physician and astronomer, Mercator mastered the essentials of mathematics, geography, and astronomy. Frisius and Mercator also frequented the workshop of Gaspar à Myrica, an engraver and goldsmith. The combined work of these three men soon made Louvain an important centre for the construction of globes, maps, and astronomical instruments. In...
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