gnomonics การใช้

• He worked in a wide range of mathematical fields, including practical geometry, arithmetic, optics, gnomonics, astronomy and instrumentalism.
• There he lived for fourteen years, engaged in mathematics and in physical experiments, and publishing his work on gnomonics and perspective.
• The Sunquest Sundial has been featured in several other publications, including " Sundials : The Art and Science of Gnomonics ", " Scientific American " and " Sundials : Their Theory and Construction ".
• In 1760 he published " " La Gnomonique pratique ou l Art de tracer les cadrans solaires " " under the patronage of the Jean-Paul Grandjean de Fouchy, Secretary of the Academy of Sciences and an authority in gnomonics and sundials.