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
... graduations on the circular heads C and D of the screws . The angular value of each graduation depends on the magnifying power of the telescope to which the micrometer is applied , and it must always be determined by observation : this ...
... graduations on the circular heads C and D of the screws . The angular value of each graduation depends on the magnifying power of the telescope to which the micrometer is applied , and it must always be determined by observation : this ...
Page 63
... graduations of the circle is by the disposition of the lenses made to fall at the place of a wire or of a pair of wires crossing each other at an acute angle near the eye - end of the tube . Now the smaller kind of astronomical circles ...
... graduations of the circle is by the disposition of the lenses made to fall at the place of a wire or of a pair of wires crossing each other at an acute angle near the eye - end of the tube . Now the smaller kind of astronomical circles ...
Page 66
... graduations of the circle : a spirit level attached to the bar serves to indicate the exact horizontality of the line joining the opposite indexes . The use of this circle is to obtain roughly the altitude of a celestial body at the ...
... graduations of the circle : a spirit level attached to the bar serves to indicate the exact horizontality of the line joining the opposite indexes . The use of this circle is to obtain roughly the altitude of a celestial body at the ...
Page 67
... graduation of the scale may be determined by the maker of the instrument , or the astronomer may determine it himself by placing the level on the connecting bars of a graduated circle which is capable of turning in altitude , and ...
... graduation of the scale may be determined by the maker of the instrument , or the astronomer may determine it himself by placing the level on the connecting bars of a graduated circle which is capable of turning in altitude , and ...
Page 76
... graduations , in order that the angular admeasurement may be read on any part of the cir- cumference at pleasure . 98. In general the horizontality of the axis of motion is verified by means of plumb - lines , or spirit - levels , or by ...
... graduations , in order that the angular admeasurement may be read on any part of the cir- cumference at pleasure . 98. In general the horizontality of the axis of motion is verified by means of plumb - lines , or spirit - levels , or by ...
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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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