Joannes Disma Floriantschitsch de Grienfeld

Joannes Disma Floriantschitsch de Grienfeld, in Slovene Ivan or Janez Dizma Florjančič de Grienfeld, was a Carniolan astronomer, mathematician, geographer and cartographer, born in Ljubljana on 1 July 1691 and dead in 1757. He held a series of church offices and ended his career in 1757 as archdeacon of Stična Abbey. In 1744 he published the first map of Carniola, the Ducatus Carnioliae Tabula Chorographica, at a scale of 1:111,000. He also wrote a book on gnomonics and a work on measuring time and built his own observatory. Two Latin manuscripts of his, kept in the National and University Library of Slovenia in Ljubljana, preserve essays on astronomy and mathematics, tables with instructions for astronomical calculations, a theory of the movements of the Sun, the Moon and the planets for the Ljubljana meridian, a geometry manual, writings about squaring the circle and his own observations of the Sun and Moon.