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 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
... wires being parallel to one another . There is be- sides , usually fixed to one of the plates , a fine 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 ...
... wires being parallel to one another . There is be- sides , usually fixed to one of the plates , a fine 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 ...
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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Common terms and phrases
aberration altitude angular distance apparent ascension and declination astronomical axis azimuth bisected celestial body celestial sphere centre circumference co-ordinates colatitude computed considered correction cotan degrees described determined diameter difference earth ecliptic ellipse equal equator equatorial equinoctial point expressed fixed star formula geocentric given Greenwich horary horizontal parallax hour angle inclination instant instrument intersection interval latitude latter let fall longitude mean meridian micrometer moon moon's motion Nautical Almanac node nutation obliquity observed obtained parallax parallel perihelion perpendicular plane passing polar distance pole position primitive circle radius vector refraction represented revolution revolve right angles right ascension satellite sector semidiameter side sidereal sin.² sine sphere spherical triangle star's station substituting subtended subtracted sun's supposed surface tangent telescope transit transit telescope Trigon trigonometry vertical whence wire zenith distance zero