Outlines of AstronomyLongman, green and Roberts, 1859 - 714 pages |
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Page 17
... represented by the sphere LHN Q , whose centre is C , and let A , G , M be stations at different elevations above various points of its surface , represented by a , g , m respectively . From each of them ( as from M ) let a line be ...
... represented by the sphere LHN Q , whose centre is C , and let A , G , M be stations at different elevations above various points of its surface , represented by a , g , m respectively . From each of them ( as from M ) let a line be ...
Page 23
... represented by a protuberance of no more than one hundredth part of an inch , which is about the thickness of ordinary drawing - paper . Now , as there is no entire continent , or even any very extensive tract of land , known , whose ...
... represented by a protuberance of no more than one hundredth part of an inch , which is about the thickness of ordinary drawing - paper . Now , as there is no entire continent , or even any very extensive tract of land , known , whose ...
Page 26
... represented by the sixth of an inch on the model we have before spoken of , and which is not more in proportion to the globe on which it rests , than the downy skin of a peach in comparison with the fruit within it ) , all sensible ...
... represented by the sixth of an inch on the model we have before spoken of , and which is not more in proportion to the globe on which it rests , than the downy skin of a peach in comparison with the fruit within it ) , all sensible ...
Page 68
... represented by straight lines . In celestial perspective , every point to which the view is for the moment directed , is equally entitled to be considered as the " centre of the picture , " every portion of the surface of the sphere ...
... represented by straight lines . In celestial perspective , every point to which the view is for the moment directed , is equally entitled to be considered as the " centre of the picture , " every portion of the surface of the sphere ...
Page 83
... representing the angle in question on one side of the circle , by just the same quantity by which it diminishes that on the other . Again , suppose that the proper use of the instrument required that this axis should be exactly parallel ...
... representing the angle in question on one side of the circle , by just the same quantity by which it diminishes that on the other . Again , suppose that the proper use of the instrument required that this axis should be exactly parallel ...
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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