A Practical Introduction to Spherics and Nautical Astronomy: Being an Attempt to Simplify Those Useful Sciences. ... By P. Kelly, ...
J. Johnson, and G. G. and J. Robinson, 1796 - 210 pages
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50 degrees acute adjacent angle altitude angled spheric triangle appear armillary sphere Astronomy azimuth circle celestial Celestial Longitude cliii clxxii Co-arc co-lat colure correction cosine declination diff difference ecliptic equal equator equinoctial faid fame manner fides find the angle fun's given angle given leg globe half sum half the sum horizon hypothenuse latitude leg B C lesser circle line of chords line of measures longitude lunar moon moon's Nautical Almanac oblique circle observed opposite angle parallax parallel circle perpendicular point of Aries pole prime vertical primitive circle PROBLEM quadrant Radius 90 right angled spheric right ascension right circle scale of chords secant SECTION SECTION sector semi-tangents shews Side AC side B C sine of half sphere spheric angle Spheric Trigonometry Stereographic Projection subtracted sun's suppose tangent three angles three sides tion true distance usesul zenith distance