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 48
... zero , and the formula ( a ' ) becomes , omitting the accents and introducing the radius , or r , rcos . AB cotan . B cotan . A. ( d ' ) Substituting for the terms in this formula their equivalents in the complemental triangle BFE ( fig ...
... zero , and the formula ( a ' ) becomes , omitting the accents and introducing the radius , or r , rcos . AB cotan . B cotan . A. ( d ' ) Substituting for the terms in this formula their equivalents in the complemental triangle BFE ( fig ...
Page 57
... zero : therefore , one of the formulæ ( a ) , ( b ) , or ( c ) , Prop . I. would give or cos . azb = cos . ab sin . Za ' or = Cos . ab cos . A a ' ( radius being unity ) , cos . Aca : cos . acb :: rad . ( = 1 ) : cos . ACB . A ...
... zero : therefore , one of the formulæ ( a ) , ( b ) , or ( c ) , Prop . I. would give or cos . azb = cos . ab sin . Za ' or = Cos . ab cos . A a ' ( radius being unity ) , cos . Aca : cos . acb :: rad . ( = 1 ) : cos . ACB . A ...
Page 64
... zero point of the micro- meter scale , the reading is complete : but if a division do not so coincide the wire must , by the micrometer screw , be moved up along the scale till it coincides with the next divi- sion - line on the circle ...
... zero point of the micro- meter scale , the reading is complete : but if a division do not so coincide the wire must , by the micrometer screw , be moved up along the scale till it coincides with the next divi- sion - line on the circle ...
Page 66
... so that its middle point , which for sim- plicity may be the zero of the graduations , is 66 CHAP . I V ASTRONOMICAL INSTRUMENTS . (Prop IV ) Investigations of formulæ for finding an angle of a spherical triangle in terms of its sides.
... so that its middle point , which for sim- plicity may be the zero of the graduations , is 66 CHAP . I V ASTRONOMICAL INSTRUMENTS . (Prop IV ) Investigations of formulæ for finding an angle of a spherical triangle in terms of its sides.
Page 67
... zero of the graduations , is vertically above the middle of the bubble or column of air , and to determine , by the difference of the readings at the extremities of the line , the error , if any exist , in the horizontality of the axis ...
... zero of the graduations , is vertically above the middle of the bubble or column of air , and to determine , by the difference of the readings at the extremities of the line , the error , if any exist , in the horizontality of the axis ...
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Practical Astronomy and Geodesy: Including the Projections of the ..., Volume 5 John Narrien No preview available - 2016 |
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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