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Fit for a King: Decoding the Great Sloane Astrolabe and Other English Astrolabes with “Quatrefoil” Retes

In: Medieval Encounters
Author:
John Davis Independent Scholar, Orchard View Tye Lane, Flowton, Suffolk, ip8 4ld UK

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Abstract

The great Sloane astrolabe in the British Museum is the largest and most important of all medieval English instruments and yet its history is completely lost. In this paper, evidence from its various engravings is used to show that it is likely to have been commissioned, ca. 1326, by Richard de Bury as a teaching tool for Prince Edward of Windsor who was soon to become King Edward iii. Comparisons are made with two illuminated manuscripts, the “Milemete Treatise” and a copy of the Secretum Secretorum, which were also used in the Prince’s education. Two other medieval astrolabes, now in Liège and in the London Science Museum, are believed to be closely associated with the Sloane instrument and derived from it.

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