Outlines of AstronomyLongman, green and Roberts, 1859 - 714 pages |
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Page xix
... increase the accuracy of pointing . Simplest application of this principle . The transit instrument . Of the measurement of angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural ...
... increase the accuracy of pointing . Simplest application of this principle . The transit instrument . Of the measurement of angular intervals . Methods of increasing the accuracy of reading . The vernier . The microscope . Of the mural ...
Page xxii
... increase and diminu- tion . Average effect in a whole revolution . Compensation in a com- plete revolution of the nodes . Lagrange's theorem of the stability of the inclinations of the planetary orbits . Change of obliquity of the ...
... increase and diminu- tion . Average effect in a whole revolution . Compensation in a com- plete revolution of the nodes . Lagrange's theorem of the stability of the inclinations of the planetary orbits . Change of obliquity of the ...
Page 18
... increase that angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident ... increases ; 2dly , that the distance . of the visible horizon or boundary of our view from the eye , Opigw , to ...
... increase that angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident ... increases ; 2dly , that the distance . of the visible horizon or boundary of our view from the eye , Opigw , to ...
Page 31
... increases . Objects near the horizon appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the ...
... increases . Objects near the horizon appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the ...
Page 51
... increase or diminution of the angle subtended , that one point of the earth is nearer to or further from the stars than another . ( 73. ) The necessary conclusion from this is , that the dimensions of the earth , large as it is , are ...
... increase or diminution of the angle subtended , that one point of the earth is nearer to or further from the stars than another . ( 73. ) The necessary conclusion from this is , that the dimensions of the earth , large as it is , are ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical attraction axis bright calculation celestial circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination increase inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian moon moon's motion nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations phænomena planet planetary pole portion position precession precisely proper motions proportion recede recess reckoned refraction remarkable render respect result revolution revolving right ascension ring rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible whole zenith