Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |
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Page xi
... wires at the focus of the object glass , and the man- ner of enlightening them at night 83. The attached circle for obtaining altitudes approximatively 84. Description of the spirit level , and the manner of ... wire to CONTENTS . xi.
... wires at the focus of the object glass , and the man- ner of enlightening them at night 83. The attached circle for obtaining altitudes approximatively 84. Description of the spirit level , and the manner of ... wire to CONTENTS . xi.
Page xii
... wire and those which are parallel to it are in vertical positions , and that the wire at right angles to them is horizontal - - 69 70 - 71 90. Use of two , or a greater number of wires parallel to the me- ridional wire 91. Manner of ...
... wire and those which are parallel to it are in vertical positions , and that the wire at right angles to them is horizontal - - 69 70 - 71 90. Use of two , or a greater number of wires parallel to the me- ridional wire 91. Manner of ...
Page 61
... wire in the middle of the field of view , the time shown by the sidereal clock at that instant would express the apparent right ascension of the star . On the other hand , if it were required to make the clock express sidereal time , it ...
... wire in the middle of the field of view , the time shown by the sidereal clock at that instant would express the apparent right ascension of the star . On the other hand , if it were required to make the clock express sidereal time , it ...
Page 62
... wires bisect the object , move the other by causing its screw to make any number of revo- lutions ; then the azimuth circle being turned till this last wire appears to bisect the object , the difference between the two readings on the ...
... wires bisect the object , move the other by causing its screw to make any number of revo- lutions ; then the azimuth circle being turned till this last wire appears to bisect the object , the difference between the two readings on the ...
Page 63
John NARRIEN. wire in the first , to the same wire in the second position , 15 t ( since by the rotation of the earth on its axis in 24 hours every point in the heavens appears to describe about that axis an angle or arc equal to 15 ...
John NARRIEN. wire in the first , to the same wire in the second position , 15 t ( since by the rotation of the earth on its axis in 24 hours every point in the heavens appears to describe about that axis an angle or arc equal to 15 ...
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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