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‘In his Euclid a series of references is provided to the arithmetical treatises; several portions of his Archimedes are strictly related to his works on Apollonius and on conic sections, the latter referring in turn to researches in gnomonics.’
‘His Analemma was mathematical description of a sphere projected on a plane, subsequently known as an ‘orthographic projection,’ which greatly simplified the study of gnomonics.’
‘We know of gnomonics applied to architecture in another geometrical monument, Castel del Monte, from the studies of Aldo Tavolaro published in 1981.’
‘Guarini was therefore proficient in the French tradition of stone cutting using most difficult procedures, as well as gnomonics, or the study of sundials, devoting many published pages to each discipline.’
‘Two incomplete writings regarding the mathematics and design of sundials, including one by the architectural writer Vitruvius, have survived, reinforcing the notion that gnomonics was indeed an active area of mathematical pursuit.’
‘When one of them, the young Christopher Wren, went to Wadham in 1650, he was already interested in gnomonics.’
‘In the modern era, however, neither astronomy, nor surveying, nor gunnery, nor gnomonics (the making of sundials), nor most of the other disciplines represented in this collection of instruments, could be called a branch of mathematics in any straightforward or unqualified way, even though they all make some use of mathematical techniques.’
‘In al-Marrakushi's work are developed the construction of planispheres, astrolabes, quadrants and the need of gnomonics, which constituted the great interest of Sedillot who had written by far the best account on Muslim astronomical instruments.’
‘It is the work of one of the leading Italian proponents of the graphical method in dialing, and it fills a significant hole in the literature of gnomonics, representing a full treatment of classical dials as derived from the analemma.’
‘Although the Romans were backward in the science of gnomonics and slow to adopt any particular form of horologe, they eventually constructed many beautiful sundials of various designs.’