Description and Use of a Diagram of Navigation: By which All Problems in Plane, Traverse, Parallel, Middle Latitude and Mercator's Sailing May be Instantly and Accurately Resolved. Adapted to the Capacity of All who Know the Use of Figures. Designed as an Easy Introduction, by Sensible Demonstration, to the Principles, and the Practice of Navigation. With a Diagram Engraved
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arc of latitude arc or angle circle circumference co-sine co-tangent contiguous angle course 3 points course 38 course and DEPARTURE course and distance curve line departure 84 departure will give Diagram of Navigation diff lat diff lon diff of lat difference of lati difference of latitude difference of longitude direct course dist distance 104 distance sailed ence of longitude Example.—A ship sails Example.—Given find the course find the DISTANCE give the course give the diff give the distance given Given—both LATITUDEs Given—one LATITUDE Given—the index remaining index set index to meet latitude will give Mercator's sailing meridian distance meridional difference middle lat middle latitude parallel sailing plane sailing proper diff radius be equal required the course right line drawn right-angled plane triangle Rule.—Set the index secant set the index ship in lat side as radius side marked equator tance tangent Theorem.—In a right-angled trigonometry tude