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 |
From inside the book
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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 using ... 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 using ... 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 · · - · 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 · · - · 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
... wire mn at right angles to both pq and st . The plates are capable of a rectilinear motion in the direction AB , perpendicular to the axis of the telescope , by means of screws ... wire, when the transits have not been observed at the wires.
... wire mn at right angles to both pq and st . The plates are capable of a rectilinear motion in the direction AB , perpendicular to the axis of the telescope , by means of screws ... wire, when the transits have not been observed at the wires.
Page 63
... 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 degrees in an ...
... 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 degrees in an ...
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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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