Practical Astronomy and Geodesy: Including the Projections of the Sphere and Spherical Trigonometry. For the Use of the Royal Military CollegeLongman, Brown, Green, and Longmans, 1845 - 427 pages |
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Page 62
... turned till this last wire appears to bisect the object , the difference between the two readings on the circle when the object was bisected , being divided by the number of revolutions , will give the value of an angle subtended at the ...
... turned till this last wire appears to bisect the object , the difference between the two readings on the circle when the object was bisected , being divided by the number of revolutions , will give the value of an angle subtended at the ...
Page 63
... turned about the optical axis of the telescope , and be provided with a graduated circle , as EF , whose centre is in that axis , so that the position of the mi- crometer wires with respect to the plane of any vertical , or horary ...
... turned about the optical axis of the telescope , and be provided with a graduated circle , as EF , whose centre is in that axis , so that the position of the mi- crometer wires with respect to the plane of any vertical , or horary ...
Page 64
... turned in taking the angle . 81. The transit instrument is a telescope whose tube con- sists of two cylindrical parts united near the middle of its length to the opposite sides of a portion which is either cubical or globular . At right ...
... turned in taking the angle . 81. The transit instrument is a telescope whose tube con- sists of two cylindrical parts united near the middle of its length to the opposite sides of a portion which is either cubical or globular . At right ...
Page 66
... turned on an axis so that its inclination to the optical axis of the telescope may be reversed , and thus the light from the lamp may be thrown at pleasure towards either extremity : by this contrivance in- accuracies in the form of the ...
... turned on an axis so that its inclination to the optical axis of the telescope may be reversed , and thus the light from the lamp may be thrown at pleasure towards either extremity : by this contrivance in- accuracies in the form of the ...
Page 67
... turning in altitude , and reading the number of minutes of a degree through which the circle is turned , in order to make the air bubble move under any convenient number of graduations on the scale . Now the length of the column of air ...
... turning in altitude , and reading the number of minutes of a degree through which the circle is turned , in order to make the air bubble move under any convenient number of graduations on the scale . Now the length of the column of air ...
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Other editions - View all
Practical Astronomy and Geodesy: Including the Projections of the ..., Volume 5 John Narrien No preview available - 2016 |
Common terms and phrases
angular distance apparent ascension and declination astronomical azimuth bisected celestial body celestial sphere centre circle passing circumference colatitude computed considered correction corresponding cosine cotan degrees described determined diameter difference earth ecliptic ellipse equal equator equatorial equinoctial point expressed fixed star formula geocentric given graduation Greenwich Greenwich mean horary motions horizontal parallax hour angle index error instant instrument interval latitude latter let fall limb longitude mean noon meridian micrometer moon moon's Nautical Almanac node observed altitude obtained optical axis orbit parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter side sidereal sidereal clock sine sphere spherical triangle star's station subtended subtracted supposed surface tangent transit telescope true variation vertical wire zenith distance zero
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