Outlines of Astronomy |
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Page 20
... telescope , and some other of the simpler instruments . Of course , the more of such knowledge he brings to the perusal , the easier will be his progress , and the more complete the information gained ; but we shall endeavour in every ...
... telescope , and some other of the simpler instruments . Of course , the more of such knowledge he brings to the perusal , the easier will be his progress , and the more complete the information gained ; but we shall endeavour in every ...
Page 51
... telescope accurately to the proper places . Indeed , from the bottoms of deep narrow pits , such as a well , or the shaft of a mine , such bright stars as pass the zenith may even be discerned by the naked eye ; and we have ourselves ...
... telescope accurately to the proper places . Indeed , from the bottoms of deep narrow pits , such as a well , or the shaft of a mine , such bright stars as pass the zenith may even be discerned by the naked eye ; and we have ourselves ...
Page 77
... telescopes to the purposes of angular measurement , every imperfection of structure of division becomes magnified by the whole optical power of that instru- ment ; and that thus , not only direct errors of workmanship , arising from ...
... telescopes to the purposes of angular measurement , every imperfection of structure of division becomes magnified by the whole optical power of that instru- ment ; and that thus , not only direct errors of workmanship , arising from ...
Page 89
... telescope is applied in astro- nomy to the precise determination of a direction in space , that , namely , of the visual ray by which we see a star or any other distant object . ( 154. ) The telescope most commonly used in astronomy for ...
... telescope is applied in astro- nomy to the precise determination of a direction in space , that , namely , of the visual ray by which we see a star or any other distant object . ( 154. ) The telescope most commonly used in astronomy for ...
Page 90
... telescope , will be necessary to vary the direction of the axis till the coincidence is rendered perfect . So precise is this mode of pointing found in practice , that the axis of a telescope may be directed towards a star or other ...
... telescope , will be necessary to vary the direction of the axis till the coincidence is rendered perfect . So precise is this mode of pointing found in practice , that the axis of a telescope may be directed towards a star or other ...
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Common terms and phrases
altitude amount angle angular appear apsides ascertained astronomers axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic effect ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater heavens heliocentric 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 perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith