Outlines of astronomy |
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Page 15
... 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 19
... 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 27
... false impression respecting their places , which must be rectified by ascertaining the amount and direction of the displacement so apparently produced on each , before we can come at a knowledge of the true directions in REFRACTION . 27.
... false impression respecting their places , which must be rectified by ascertaining the amount and direction of the displacement so apparently produced on each , before we can come at a knowledge of the true directions in REFRACTION . 27.
Page 28
... direction of the straight line A S. But , in reality , when the ray of light S A reaches the atmosphere , suppose at d , it will , by the laws of optics , begin to bend downwards , and take a more inclined direction , as d c . This ...
... direction of the straight line A S. But , in reality , when the ray of light S A reaches the atmosphere , suppose at d , it will , by the laws of optics , begin to bend downwards , and take a more inclined direction , as d c . This ...
Page 29
... 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
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 Edition effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Julian period 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 proper motions proportion recede reckoned refraction remarkable respect result revolution revolving right ascension 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 vols whole zenith