Spherical Trigonometry: For Colleges and Secondary Schools

ABC Fig accordingly altitude ambiguous angular celestial sphere centre circle passing compute construct cos² deduced Delambre's Analogies denote derived described in Art diedral angle draw drawn earth ecliptic equator EXAMPLES face angles formulas frustum geometry given point greater than 90 Hence hour angle included angle intersection latitude law of cosines Law of Sines logarithms longitude meridian Napier's Analogies NOTE number of degrees original triangle perpendicular plane angle plane triangles Plane Trigonometry polar triangle polyedron Proposition radians radii relations respectively equal right angles right ascension right spherical triangle right triangles right-angled triangle satisfies the given semicircle Show sides and angles sin b sin sin² solid angle solution Solve ABC Solve the triangle sphere of radius spherical angle spherical degree measure spherical excess spherical measure spherical polygon spherical triangle ABC spherical trigonometry star subtended sun's declination three angles triedral