American practical navigator: an epitome of navigation and nautical astronomy (1914)
Bowditch, Nathaniel, 1773-1838, United States. Navy Dept. Bureau of Equipment, Logan, George Wood, 1868-1915 · Washington, Govt. Print. Off. · leaf 82
tude 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 me-ridians PM and PM; K, the equatorial radius of the earth,CM = CT; r, the radius OT of the parallel TT; and L, the latitude of that parallel. Then,… … D.Lo R ; 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 oflongitude between two places on the same parallel is given, to find the…
Navigation · Nautical astronomy
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