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Origins of the Idea
William Andrewes

The Longitude Dial is based on an idea proposed in 1607 by Franz Ritter of Nuremburg. In his quest to promote "the noble art of making sundials," Ritter devised and published a world map projected from Nuremburg, with its lines of longitude arrayed to serve also as hour lines. However, the difficulties of creating a new projection for each location and the expense of producing it in durable materials were considerable. Ritter's gnomonic projection map does not appear to have been developed for use in sundials - until now.

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