Practical navigation [electronic resource] : or an introduction to the whole art, Containing many useful Geometrical Definitions and Problems; The Doctrine of Plain and Spherical Triangles; Plain Mercator, and Great-Circle Sailing; Sundry useful Problems in Astronomy; The Use of Instruments; The Azimuth-Compass and Ring-Dial. The Fore Staff, Quadrant, and Nocturnal; The Plian Scale, Gunter's Scale, Plain-Chart, Mercator's-Chart, both Globes, and Virtues of the Loadstone. Useful Tables of the Moon's Age, of the Tides, of the Sun's Place, Declination, and Right Ascension; of the Stars Right Ascension and Declination; The Latitude and Longitude of Places, and a Table of Meridional Parts; Likewise a new Traverse-Table, and the Use thereof in keeping a Reckoning at Sea: Also a Table of 10000 Logarithms, and of the Logarithm Sines, Tangents, and Secants, All carefully Corrected with many useful Additions. By John Seller, Hydrographer to the King.