American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, Logan, George Wood, 1868-1915, United States. Navy Dept. Bureau of Equipment · Washington, Govt. Print. Off · leaf 82
ted between their meridians PM and PM:and TT, the departure on the parallel whose latitude isTCM=OTC, and whose radius is OT. Let D.Lo represent the arc of the equator MM, which isthe measure of MPM, the difference of longitude of the meridians PM and PM; R, the equatorial radius of the earth,CM =… … TT^ = OT. Dep. rMM CM; or D.Lo R. From the triangle COT, r =Dep. _R cos L ~T cos L; hence; or, D.Lo = Dep. sec. L; or/Dep.=D.Lo cos L. Thus the relations are expressed between minutes of longitude and miles ofdeparture. 174. Two cases arise under Parallel Sailing: First, where the difference…
Navigation · Nautical astronomy
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