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

### From inside the book

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Page viii

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**latitude**: celestial longitude and**latitude**; right ascension and declination 19. Ecliptical and equatorial systems of co - ordinates · Page 7 7 8 8 ∞ ∞ 9 9 · 10 10 11 20. Horizontal systems of co - ordinates ; azimuth and altitude ... Page xiii

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**LATITUDE**OF A STATION : PARALLAX . 141. Cause of the refraction of light : it takes place in a vertical plane 105 142. Refraction varies with the tangent of the zenith distance , as- suming the earth to be a plane and the upper surface ... Page xiv

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**latitude**of a station found by circumpolar stars 151. Nautical and geocentric**latitude**explained 152. Formula of reduction from one kind of**latitude**to the other 113 153. Parallax defined 154. Investigation of a formula for the parallax ... Page xvi

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**latitude**and longitude of a celestial body ; and the converse 189. Manner of computing the right ascension and declination of the sun , having his longitude and the obliquity of the ecliptic ; and the converse 146 190. Investigation of ... Page xvii

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**latitude**and radius vector . - 170 - 172 · · 172 The - · 172 constant of the parallax 224. Elementary method of finding an approximation to the earth's distance from the sun , that of the moon from the earth being given · CHAP . X ...### 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