Antonio Romira y Rafassa - Tratado de Gnomónica - 1896

"Tratado de Gnomónica" by Antonio Romira y Rafassa, published in 1896, is a treatise on gnomonics—the art and science of sundial construction and the measurement of time through shadow observation. Sundials are among the oldest timekeeping devices, utilizing the position of the sun's shadow cast by a gnomon to indicate the hour. Works like this explore mathematical principles, geometrical design, and practical techniques to create accurate sundials adapted for different latitudes and styles. This specialized subject combines astronomy, geometry, and craftsmanship, reflecting a rich tradition in horology and timekeeping before the widespread use of mechanical clocks.