Elements of Plane and Spherical Trigonometry: With Their Applications to Heights and Distances Projections of the Sphere, Dialling, Astronomy, the Solution of Equations, and Geodesic Operations |
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Common terms and phrases
altitude angled spherical triangle azimuth base becomes centre chap chord circle circle of latitude computation cos² cosec cosine cot A cot declination deduced determine dial difference distance draw earth ecliptic equa equal equation Example find the rest formula given side h cos h half Hence horizon hour angle hour line hypoth hypothenuse included angle intersecting latitude logarithmic longitude measured meridian oblique opposite angle parallel perp perpendicular plane angles plane triangle pole problem prop quadrant radius right angled spherical right angled triangle right ascension right line secant sin a sin sin² sine sine and cosine solid angle sphere spherical triangle spherical trigonometry sun's supposed surface tan² tangent theorem three angles three sides tion triangle ABC values versed sine versin vertical angle whence zenith