Outlines of Astronomy |
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Page 49
... described are not of the same magnitude for all the stars ; and that those described by different stars differ greatly in respect of the parts of them which lie above the horizon . Some , which lie towards the quarter of the horizon ...
... described are not of the same magnitude for all the stars ; and that those described by different stars differ greatly in respect of the parts of them which lie above the horizon . Some , which lie towards the quarter of the horizon ...
Page 50
... described in the last article , become actually inverted with respect to the horizon , while , on the other hand , they always turn the same points towards the pole . In short , he will perceive that the whole assemblage of stars ...
... described in the last article , become actually inverted with respect to the horizon , while , on the other hand , they always turn the same points towards the pole . In short , he will perceive that the whole assemblage of stars ...
Page 52
... described their whole diurnal circles above his horizon , and never set , now describe them entirely below it , and never rise , but remain constantly invisible to him ; and vice versa , those 52 OUTLINES OF ASTRONOMY .
... described their whole diurnal circles above his horizon , and never set , now describe them entirely below it , and never rise , but remain constantly invisible to him ; and vice versa , those 52 OUTLINES OF ASTRONOMY .
Page 53
... described by each star , too , becomes more nearly parallel to the horizon ; and , in short , every appearance leads to suppose that could he travel far enough to the north , he would at length attain a point vertically under the ...
... described by each star , too , becomes more nearly parallel to the horizon ; and , in short , every appearance leads to suppose that could he travel far enough to the north , he would at length attain a point vertically under the ...
Page 67
... described uniformly in 24 hours , 15 ° must be so described in 1 hour ) , will express the interval of sidereal time which elapses from the passage of the vernal equinox across the meridian to that of the object next subsequent . ( 111 ...
... described uniformly in 24 hours , 15 ° must be so described in 1 hour ) , will express the interval of sidereal time which elapses from the passage of the vernal equinox across the meridian to that of the object next subsequent . ( 111 ...
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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