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 64
... 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 angles to the tube is an axis of ...
... 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 angles to the tube is an axis of ...
Page 65
... One of the arms of the axis of motion is hollow , and a lamp being attached to the pier , or side of the stand on which that arm F rests , light passes through the arm into the telescope. CHAP . IV . 65 TRANSIT TELESCOPE .
... One of the arms of the axis of motion is hollow , and a lamp being attached to the pier , or side of the stand on which that arm F rests , light passes through the arm into the telescope. CHAP . IV . 65 TRANSIT TELESCOPE .
Page 66
... transit : or , the meridian altitude being previously com- puted , the observer is enabled by the circle to direct the tele- scope to the apparent place of the body on the meridian , preparatory to the observation of the transit . 84 ...
... transit : or , the meridian altitude being previously com- puted , the observer is enabled by the circle to direct the tele- scope to the apparent place of the body on the meridian , preparatory to the observation of the transit . 84 ...
Page 67
... and the second excess equal to 0.8 divisions , or 4 " , also towards the west ; then half their sum , or 1.6 divisions ( = 8 " ) will be F 2 CHAP . IV . 67 TRANSIT TELESCOPE . (Prop V ) Investigations of formulæ for determining two.
... and the second excess equal to 0.8 divisions , or 4 " , also towards the west ; then half their sum , or 1.6 divisions ( = 8 " ) will be F 2 CHAP . IV . 67 TRANSIT TELESCOPE . (Prop V ) Investigations of formulæ for determining two.
Page 68
... transit of a star may be thus determined . Let NZN ' represent the plane of the meridian , NZN ' half a great circle of the sphere , in which the telescope is supposed to turn , the line NON ' in the plane of the meridian being parallel ...
... transit of a star may be thus determined . Let NZN ' represent the plane of the meridian , NZN ' half a great circle of the sphere , in which the telescope is supposed to turn , the line NON ' in the plane of the meridian being parallel ...
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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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