## Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |

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John NARRIEN. PRACTICAL ASTRONOMY AND GEODESY : INCLUDING THE PROJECTIONS OF THE

John NARRIEN. PRACTICAL ASTRONOMY AND GEODESY : INCLUDING THE PROJECTIONS OF THE

**SPHERE**AND**SPHERICAL**TRIGONOMETRY . For the Use of the Royal Military College . BY JOHN NARRIEN , F.R.S. & R.A.S. PROFESSOR OF MATHEMATICS , ETC. IN THE ... Page iii

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**Spherical**Trigonometry . VI . The Prin- ciples of Mechanics , and VII . Physical Astronomy . Royal Military College , 1844 . * Published . † Ready for the press . PREFACE . THE courses of study pursued at the military A 2. Page vii

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**SPHERE**. Art . - - - 1. Proofs that the surface of the earth is accurately or nearly that of a**sphere**· Page - 1 2. Definition of the plane of the horizon , the plane of the meridian , a meridian line , its north and south points , a ... Page viii

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**sphere**considered as infinitely great with respect to the group 16. Trace of the ecliptic ; its poles : circles of celestial longitude - 17. Division of the ecliptic into signs . - Direct and retrograde movements defined 18. The equator ... Page ix

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**sphere**be described about each of the intersections of two circles of the**sphere**as a pole , at equal distances , the intercepted arcs are equal 31. ( Prop . VI . ) The projected poles of any circle of the**sphere**, and the centre of ...### Contents

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### Common terms and phrases

aberration altitude angular distance apparent ascension and declination astronomical axis azimuth bisected celestial body celestial sphere centre circle colatitude computed considered correction corresponding cotan degrees described determined diameter difference disk earth ecliptic ellipse equal equator equatorial equinoctial point error expressed fixed star formula given Greenwich heliocentric horary horizontal parallax hour angle instant instrument interval latitude latter let fall mean meridian micrometer moon moon's motion movement Nautical Almanac nearly node noon nutation obliquity observed obtained P'PR parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius vector refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter sidereal sidereal clock sine solar sphere spherical triangle star's station subtracted sun's supposed surface tangent telescope transit transit telescope Trigon variation vertical wire zenith distance zero