Outlines of Astronomy |
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Page 37
... poles , some slight deviation from the rigorous expression of this law takes place , and in peculiar localities there is reason to believe that even considerable permanent depressions of the contours of these strata , below their ...
... poles , some slight deviation from the rigorous expression of this law takes place , and in peculiar localities there is reason to believe that even considerable permanent depressions of the contours of these strata , below their ...
Page 47
... poles or extremities , where it meets the surface , correspond always to the same points on the sphere . Modes of rotation of a solid body under the influence of external agency are con- ceivable , in which the poles of the imaginary ...
... poles or extremities , where it meets the surface , correspond always to the same points on the sphere . Modes of rotation of a solid body under the influence of external agency are con- ceivable , in which the poles of the imaginary ...
Page 49
... POLE , which appears to be the common centre of all their motions , and which alone , in the whole heavens , may be considered immoveable . Not that this point is marked by any star . It is a purely imaginary centre ; but there is near ...
... POLE , which appears to be the common centre of all their motions , and which alone , in the whole heavens , may be considered immoveable . Not that this point is marked by any star . It is a purely imaginary centre ; but there is near ...
Page 50
... pole . In short , he will perceive that the whole assemblage of stars visible at once , or in succes- sion , in the heavens , may be regarded as one great constellation , which seems to revolve with a uniform motion , as if it formed ...
... pole . In short , he will perceive that the whole assemblage of stars visible at once , or in succes- sion , in the heavens , may be regarded as one great constellation , which seems to revolve with a uniform motion , as if it formed ...
Page 51
... pole above his horizon , in which the stars never set , so there is a corresponding segment , about which the ... pole to the south , corresponding to the elevated one to the north , aud a portion surrounding it , perpetually beneath ...
... pole above his horizon , in which the stars never set , so there is a corresponding segment , about which the ... pole to the south , corresponding to the elevated one to the north , aud a portion surrounding it , perpetually beneath ...
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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