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 279
e. Let ABC (fig. 83) be a plane right triangle in which C is theright angle; A and B, the other angles; c, the hypotenuse; a andb the sides opposite the angles A and B, respectively. In consideringthe functions of the angle A, its opposite side, a, is regarded aa theperpendicular, and its adjacent… … base -, is called the cosine of the angle A, abbreviated cos A; c hypotenuse £, or pe^Pedicular^ j^ caWeA the tangent of the angle A, abbreviated tan A;0 base A, or ^f ,—, is called the cotangent of the angle A, abbreviated cot A; a perpendicular -i-> or -^-^ > is called the secant of the…
Navigation · Nautical astronomy
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