Trigonometrie: or, The doctrine of triangles. First written in Latine, by Bartholmevv Pitiscus of Grunberg in Silesia, and now translated into English, by Ra: Handson. Whereunto is added (for the marriners vse) certaine nauticall questions, together with the finding of the variation of the compasse. All performed arithmetically, without map, sphære, globe, or astrolabe; by the said R.H.