Horographia trigonometrica seu methodus accuratissima arithmetice per sinus et tangentes, horologia quaevis solaria in plano stabili qualitercunque situato, etiam declinante & simul inclinato, facili negotio describendi, & quaedam alia, quae vialia dicuntur &c. cum suis fundamentis & rationibus in gratiam aliorum exhibita
A 1718 Latin treatise on sundial construction by Bernhard Gruber, printed by Wolfgang Wickhart, offering a trigonometric method for laying out sundials on any plane, including declining and inclined surfaces. The pictures are copperplate-style geometric diagrams of circles, sight lines, and angled gnomon projections on folding plates, useful to a designer seeking precise radial and hour-line patterns.
