Outlines of Astronomy |
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Page 27
... 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 ; and when ...
... 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 ; and when ...
Page 28
... direction , but also an under side round which the sun , moon , and stars can pass ; and that side must , at least , be so far like what we see , that it must have a sky and sunshine , and a day when it is night to us , and vice versâ ...
... direction , but also an under side round which the sun , moon , and stars can pass ; and that side must , at least , be so far like what we see , that it must have a sky and sunshine , and a day when it is night to us , and vice versâ ...
Page 30
... direction in which a plumb - line would hang ; for it is an observed fact , that in all situations , in every part of the earth , the direction of a plumb - line is exactly perpendicular to the surface of still water ; and , moreover ...
... direction in which a plumb - line would hang ; for it is an observed fact , that in all situations , in every part of the earth , the direction of a plumb - line is exactly perpendicular to the surface of still water ; and , moreover ...
Page 37
... direction of the displacement so apparently pro- duced on each , before we can come at a knowledge of the true directions in which they are situated from us at any assigned moment . ( 39. ) Suppose a spectator placed at A , any point of ...
... direction of the displacement so apparently pro- duced on each , before we can come at a knowledge of the true directions in which they are situated from us at any assigned moment . ( 39. ) Suppose a spectator placed at A , any point of ...
Page 38
... direction which the visual ray has at the instant of arriving at the eye , without regard to what may have been ... directions around A , the visual ray will not be made to deviate laterally , but will remain constantly in the same ...
... direction which the visual ray has at the instant of arriving at the eye , without regard to what may have been ... directions around A , the visual ray will not be made to deviate laterally , but will remain constantly in the same ...
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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