Spherical Trigonometry

a₁ apply Napier's rules astronomical triangle azimuth B₁ B₂ C₁ C₂ celestial equator celestial sphere computed cos² declination diameter earth Example EXERCISES Solve find the distance find the latitude following right spherical following spherical triangles following triangles great-circle distance great-circle track Greenwich haversine formula Hence horizon hour angle included angle initial course L₁ latitude law of cosines law of sines lay off arc longitude M₁ M₂ measured mils Napier's analogies nautical miles observer obtain Pages perpendicular polar triangle positive primitive circle primitive plane R₁ range finder represents right ascension right spherical triangle right triangles sec² second quadrant sidereal sin b sin sin² solution solve a triangle Solve the following Solve the polar spherical trigonometry star stereographic projection subtends sunrise trihedral angle true length values vertex zenith