## 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 xxi

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**noon**sidereal time at mean**noon**under a different meridian 310. Equation of time defined . Formula for its value · - 311. Equinoctial time 312. Manner of finding the mean time at which the sun or a fixed star culminates · - 313 ... Page xxiii

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**noon**from equal al- titudes of the sun , the ship changing its place in the in- terval between the observations - - 349. Method of finding the error of a watch by equal altitudes of a fixed star or planet on the same or on different ... Page 2

John NARRIEN. to conceived to pass through the spectator and the sun at

John NARRIEN. to conceived to pass through the spectator and the sun at

**noon**, perpendicularly to the horizon , is called his meridian ; and , on the supposition that the earth is a sphere or spheroid , this plane will pass through its ... Page 4

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**noon**is nearly equal to the elevation of that luminary at the**noon**of the day which is the middle of the interval between mid - winter and mid - summer , or between mid - summer and mid - winter : it may be observed also , that the ... Page 5

John NARRIEN. distance of the sun above that plane at

John NARRIEN. distance of the sun above that plane at

**noon**on the day of midsummer , and that on the two days of the year which are equally distant from those days the sun is in the plane per- pendicular to the axis of rotation ; it ...### 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