## 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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**apparent**displacements of celestial bodies , produced by the actions of the sun , moon , and planets on the earth , and by the motions of the latter . In a chapter on Nautical Astronomy there is given a series of propositions relating ... Page vii

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**APPARENT**MOVEMENTS OF THE PLANETS . THE CIRCLES OF THE 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 ... Page xiv

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**apparent**altitude - - 114 - 114 115 155. Formula for the parallax in altitude in terms of the true al- titude · · 156. The decrements of the earth's semidiameters vary with the square of the sine of the latitude 116 157. The difference ... Page xvi

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**apparent**velocity of the sun when greatest and least ; the least and greatest angles subtended by the sun's diameter ; and the ratio between the least and greatest distances of the sun from the earth · 194. Approximation to the figure ... Page xvii

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**APPARENT**DISPLACEMENTS OF THE CELESTIAL BODIES ARISING FROM THE FIGURE AND MOTION OF THE EARTH . THE EFFECTS OF PRECESSION , ABERRATION , AND NUTATION . 225. Annual increase in the longitudes of fixed stars , and move- ment of the ...### 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