Rotating Poles, Shifting Angles and the Use of Geometry

Journal of Early Modern Studies 7 (1):15-45 (2018)
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Abstract

In The Sea–Mans Kalendar, Henry Bond predicted that magnetic declination would be 0° in 1657, and would then increase westerly for 30 years. Based on these predictions, Bond went on to claim in The Longitude Found that, by using his model of magnetism, he can offer a technique for determining longitude. This paper offers an assessment of Bond’s method for longitude determination and critically evaluates Thomas Hobbes’s so–far neglected response to Bond’s proposal in Decameron physiologicum, in which Hobbes complains about what he takes to be Bond’s implicit natural philosophy and about his use of spherical trigonometry.

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L. Georgescu
University of Groningen

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