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BIGOURDAN (Guillaume). Gnomonics: A Theoretical and Practical Treatise on the Construction of Sundials, followed by auxiliary tables relating to sundials and calendars. Paris, Gauthier-Villars, 1922. In-8, [4]-215-[1] pp., 104 figures in the text and 9 tables. Paperback, printed cover. Some foxing. A reference work devoted to gnomonics, the science of sundial construction, setting forth the astronomical and geometric principles used to calculate and draw the various types of sundials. Its author, Guillaume Bigourdan (1851–1932), an astronomer at the Paris Observatory and a member of the Academy of Sciences, presents a study that is both theoretical and practical, richly illustrated with figures and accompanied by tables to facilitate calculations.
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