Outlines of Astronomy |
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Page 27
... opposite direction to that of the ship's progress ; but , in reality , they remain at rest , and we leave them behind in the air . Still , the illusion , so far as massive objects and our own movements are concerned , remains complete ...
... opposite direction to that of the ship's progress ; but , in reality , they remain at rest , and we leave them behind in the air . Still , the illusion , so far as massive objects and our own movements are concerned , remains complete ...
Page 41
... opposite crevice , the light scattered through the apartment from this source is sufficient to prevent entire darkness in the room . The luminous lines occasionally seen in the air , in a sky full of partially bro- ken clouds , which ...
... opposite crevice , the light scattered through the apartment from this source is sufficient to prevent entire darkness in the room . The luminous lines occasionally seen in the air , in a sky full of partially bro- ken clouds , which ...
Page 46
... opposite to him , and imme- diately under his eye . ( 53. ) By such a rotation of the earth , then , as we have supposed , the horizon of a stationary spectator will be constantly depressing itself below those objects which lie in that ...
... opposite to him , and imme- diately under his eye . ( 53. ) By such a rotation of the earth , then , as we have supposed , the horizon of a stationary spectator will be constantly depressing itself below those objects which lie in that ...
Page 49
... opposite quarter . ( 59. ) If he persist for a considerable time in watching their motions , on the same or on several successive nights , he will perceive that each star appears to describe , as far as its course lies above the horizon ...
... opposite quarter . ( 59. ) If he persist for a considerable time in watching their motions , on the same or on several successive nights , he will perceive that each star appears to describe , as far as its course lies above the horizon ...
Page 51
... opposite to it ; and as the spectator's horizon divides his sphere into two hemi- spheres a superior and inferior - there must of necessity exist a de- pressed pole to the south , corresponding to the elevated one to the north , aud a ...
... opposite to it ; and as the spectator's horizon divides his sphere into two hemi- spheres a superior and inferior - there must of necessity exist a de- pressed pole to the south , corresponding to the elevated one to the north , aud a ...
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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