A Treatise on Practical Astronomy: As Applied to Geodesy and Navigation |
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Page viii
... collimation constant . 276 279 283 284 289 291 294 295 296 302 305 Personal equation ..... Probable error and weight of transit observations .. Application of the method of least squares .. 316 318 323 Correction for flexure ... The ...
... collimation constant . 276 279 283 284 289 291 294 295 296 302 305 Personal equation ..... Probable error and weight of transit observations .. Application of the method of least squares .. 316 318 323 Correction for flexure ... The ...
Page x
... collimation and level .... Selection of stars - Method of observing . Azimuth by a circumpolar star near elongation . Correction for diurnal aberration ... Circumpolar stars at any hour - angle ... Correction for second differences in ...
... collimation and level .... Selection of stars - Method of observing . Azimuth by a circumpolar star near elongation . Correction for diurnal aberration ... Circumpolar stars at any hour - angle ... Correction for second differences in ...
Page 267
... collimation produced to the celestial sphere describes a great circle . The instrument is generally mounted so that this great circle is the meridian , and it is used in connection with the sidereal clock or chro- nometer for ...
... collimation produced to the celestial sphere describes a great circle . The instrument is generally mounted so that this great circle is the meridian , and it is used in connection with the sidereal clock or chro- nometer for ...
Page 280
... collimation . Direct the telescope to a distant terrestrial point , and bisect it with the middle thread ; then ... collimating telescope , or collimator as it is called . This is a small telescope placed north or south of the transit ...
... collimation . Direct the telescope to a distant terrestrial point , and bisect it with the middle thread ; then ... collimating telescope , or collimator as it is called . This is a small telescope placed north or south of the transit ...
Page 281
... collimation . If the collimation has been previously adjusted by the collimating telescope , this process may be employed for measuring the inclination of the axis ; it is not , however , a suitable method to employ with the portable ...
... collimation . If the collimation has been previously adjusted by the collimating telescope , this process may be employed for measuring the inclination of the axis ; it is not , however , a suitable method to employ with the portable ...
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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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