Trigonometry: or, The doctrine of triangles. First written in Latine, by Bartholomevv Pitiscus of Grunberg in Silosia, and now translated into English, by Ra: Handson. Whereunto is added (for the mariners use) 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.