Theory and use of astronomical instruments. Methods of least squaresJ.B. Lippincott Company, 1874 - Astronomical instruments |
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Common terms and phrases
alidade angular distance azimuth centre chronometer circle reading clamp clock coincidence collimation collimation axis computed constant correction declination axis declination circle denote determined difference division elimination equal equations of condition equatorial eye piece focal length formula given gives graduated heliometer Hence horizontal hour angle interval latitude lens limb magnifying power mean error measure meridian circle micrometer thread microscopes middle thread moon's motion normal equations number of observations obtained ocular optical axis parallax parallel perpendicular pivots plane pole position angle position circle prime vertical probable error rays reduced refraction revolves right ascension rotation axis screw semi-lens sextant sidereal sight line sin² star substituted suppose T₁ tan² telescope theodolite tion transit instrument tube unknown quantities vernier weight whence zenith distance zenith telescope zero