Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |
From inside the book
Results 1-5 of 46
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 ...
... 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 ...
Page 57
... zero : therefore , one of the formulę ( 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 formulę ( 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 formulę 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 formulę for finding an angle of a spherical triangle in terms of its sides.
Page 67
... zero of the scale . If the number of the graduation above each extremity of the air column be read , the excess of the greater number above half the sum of the two numbers will indicate the inclination of the axis of the spirit tube to ...
... zero of the scale . If the number of the graduation above each extremity of the air column be read , the excess of the greater number above half the sum of the two numbers will indicate the inclination of the axis of the spirit tube to ...
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Common terms and phrases
aberration altitude angular distance apparent ascension and declination astronomical axis azimuth bisected celestial body celestial sphere centre circle colatitude computed considered correction corresponding cotan degrees described determined diameter difference disk earth ecliptic ellipse equal equator equatorial equinoctial point error expressed fixed star formula given Greenwich heliocentric horary horizontal parallax hour angle instant instrument interval latitude latter let fall mean meridian micrometer moon moon's motion movement Nautical Almanac nearly node noon nutation obliquity observed obtained P'PR parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius vector refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter sidereal sidereal clock sine solar sphere spherical triangle star's station subtracted sun's supposed surface tangent telescope transit transit telescope Trigon variation vertical wire zenith distance zero