Navigational Trigonometry

15 read Almanac angular astronomical triangle azimuth bearing bottom cd L Ctn checked circle of position co-A course and distance csc a csc Ctn cd d L Tan declination difference of latitude difference of longitude DR position earth equator example EXERCISES VIII Find the latitude following triangles great-circle track Greenwich haversine formulas hour angle hour circle intersection L Cos d L.Hav latitude latitude and longitude law of cosines law of sines line of position longitude M₁ measured Mercator chart meridian meridional angle method miles on course mils Napier's analogies Napier's rules nautical miles navigation observation parallel of latitude perpendicular plane sailing polar triangle pole projection Prop quadrant radian radius read as printed read co-function right spherical triangle right triangles solution Solve the triangle star statute miles straight line tion vertex zenith zone