Gemma Frisius, His Method of Determining Differences of Longitude by Transporting Timepieces (1530), and His Treatise on Triangulation (1533)

Abstract

Comments on and text of: 1. De novo modo inveniendi longitudinem (chapter XVIII of De usu globi, in Gemma's De principiis astronomiae et cosmographiae, Antwerp, 1530); 2. the first treatise on triangulation, Gemma's Libellus de locorum describendorum ratione (annexed to Apian's Cosmographicus liber, Antwerp, 1533).

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