## Elements of Trigonometry, Plain and Spherical: Applied to the Most Useful Problems in Heights and Distances, Astronomy and Navigation: for the Use of Learners. By William Payne |

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angle abc angle acb angle bac angle of position angled spherical triangles arch df article 98 azimuth bisected C H A cafes celestial sphere CHAP chord circle abcd circumference Co-sine I Sine Co-tan complement contained angle cos.AC cotangent D E G degrees departure diff difference of latitude difference of longitude draw ecliptick equal equator equinoctial fides find the logarithm greater half sum half the sum horizon hour angle join Let abc meridian middle latitude opposite angle parallel passes thro perpendicular polar distance pole Problem Problem Proportion quadrant radius rectangle contained rhumb line right angled spherical right ascension side ac six right spherical angle spherical triangle abc Spherical Trigonometry strait line Tangent Theorem Theorem versed sine zenith distance