A Treatise on Practical Astronomy: As Applied to Geodesy and Navigation |
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Page viii
... threads .. Reduction of imperfect transits . Determination of constants : The level constant . The collimation constant . 276 279 283 284 289 291 294 295 296 302 305 Personal equation ..... Probable error and weight of transit ...
... threads .. Reduction of imperfect transits . Determination of constants : The level constant . The collimation constant . 276 279 283 284 289 291 294 295 296 302 305 Personal equation ..... Probable error and weight of transit ...
Page ix
... thread ..... Application of least squares to prime vertical transits .. CHAPTER VII . PAGE 335 338 339 343 348 352 356 358 372 DETERMINATION OF LONGItude . By transportation of chronometers 379 By the electric telegraph ... 388 By the ...
... thread ..... Application of least squares to prime vertical transits .. CHAPTER VII . PAGE 335 338 339 343 348 352 356 358 372 DETERMINATION OF LONGItude . By transportation of chronometers 379 By the electric telegraph ... 388 By the ...
Page 176
... threads for reading the circle . The micrometer ( Fig . 16a ) consists of a frame of brass , across which are stretched two spider - lines . Sometimes these lines make an acute angle with each other , as shown in the figure ; sometimes ...
... threads for reading the circle . The micrometer ( Fig . 16a ) consists of a frame of brass , across which are stretched two spider - lines . Sometimes these lines make an acute angle with each other , as shown in the figure ; sometimes ...
Page 177
... threads over this distance : then evidently one revolution moves the threads over 1 ' . If the head is divided into 60 parts , then each divi- sion of the head corresponds to a motion of the cross - threads over 1 " . By making the ...
... threads over this distance : then evidently one revolution moves the threads over 1 ' . If the head is divided into 60 parts , then each divi- sion of the head corresponds to a motion of the cross - threads over 1 " . By making the ...
Page 178
... threads to stand opposite the centre notch ( which is generally distinguished in some manner ) , and the zero point ... thread is to be moved in a negative direction it should be moved back beyond the line , and the final bisection made ...
... threads to stand opposite the centre notch ( which is generally distinguished in some manner ) , and the zero point ... thread is to be moved in a negative direction it should be moved back beyond the line , and the final bisection made ...
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Common terms and phrases
accuracy altitude angle applied approximation arithmetical mean ascension and declination axis azimuth Bessel catalogue celestial sphere centre chronograph chronometer circle circumpolar stars clamp co-ordinates coefficients collimation computation constant convenient culmination determined difference differential dt dt earth east ecliptic elongation emersion ephemeris equal example follows formulæ geocentric given gives Greenwich horizon hour-angle instant latitude limb logarithms longitude mean solar measured meridian method micrometer middle thread moon moon's right ascension multiplied Nautical Almanac obtained occultation parallax plane position prime vertical probable error proper motion reading reduced refraction right ascension screw semidiameter sextant sidereal sin² star's stars observed Substituting subtract telescope tion transit instrument unknown quantities values vernier weight write zenith distance ΙΟ
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