Biography of Juan Cedillo Díaz (s. XVI-XVII)

Spanish scientist who flourished in the time of 1599-1616. Highlighted by his studies in mathematics, nautical and engineering.

He was Professor at the Madrid Academy of math, participated in numerous scientific committees and handwritten left a number of works of mathematics, nautical and engineering, much of which are preserved in the National Library of Madrid. By Royal command, he translated into Spanish the first six books of Euclid's geometry. He wrote a treatise of the Charter of motion sickness, other on "constant North-East and noroestear needle", two astronomical observation-related texts, as well as a Castilian translation of art atque ratione navigandi by Pedro Nunes, author who exerted a great influence on Cedillo. On the other hand, was the author of a treatise on the form of "set water on the cauzas and canchiles or Mills, fountains and banks", which presents an instrument of his invention, called corobates, "which is known and examined, given two or three or more points on the surface of the Earth, which of them is more deviated or closer to the Center". He also invented the trinormo, device for measuring inclinations, heights and distances, whose construction and applications "for engineers and surveyors, sailors, architects and gunners' described in another handwritten text.



The relationship of the manuscripts of Cedillo which are preserved in the National Library of Madrid in the Repertoire of Picatoste.


FERNÁNDEZ DE NAVARRETE, M.: Maritime library Spanish. Madrid, widow of Calero, 1851. Vol. II, pp. 203-204.PICAPOSTE Rodríguez, f.: notes for a Spanish scientific library of the 16th century. Madrid, Tello, 1891, p. 42-44.