## Elements of Trigonometry |

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### Common terms and phrases

applied azimuth calculated called centre circle colatitude collimation column comp computed correction corresponding cosec cotangent course decimal declination departure determined diagram diff diﬁerence diﬂerence direction divided employed equal equation error EXAMPLE expressed feet ﬁeld ﬁgure ﬁnd ﬁnding ﬁrst ﬁxed formula Geom given number Greenwich hence horizontal hour angle hypothenuse instrument intersection limb logarithm longitude means measured meridian meridian altitude method miles multiplied Nautical Almanac number of degrees object observed obtained parallax parallel perpendicular plane sailing plane triangle polar pole proportion quadrant quotient radius reﬂected refraction right angled triangle right ascension rule sailing screw secant semidiameter ship side opposite siderial sine sine and cosine solution sphere spherical triangle spherical trigonometry spirit level star subtracted sun’s supporting axis tangent telescope transit trigonometrical lines Trigonometry vernier vertical wire zenith distance