Outlines of Astronomy |
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Page vii
... appear- ance in a form of more pretension , I have gladly availed myself of it , not only to correct some errors which , to my regret , subsisted in the former volume , but to remodel it altogether ( though in complete accordance with ...
... appear- ance in a form of more pretension , I have gladly availed myself of it , not only to correct some errors which , to my regret , subsisted in the former volume , but to remodel it altogether ( though in complete accordance with ...
Page 2
... appear to untaught eyes round bodies of no very considerable size , become en- larged in his imagination into vast globes , the one ap- proaching in magnitude to the earth itself , the other im- mensely surpassing it . The planets ...
... appear to untaught eyes round bodies of no very considerable size , become en- larged in his imagination into vast globes , the one ap- proaching in magnitude to the earth itself , the other im- mensely surpassing it . The planets ...
Page 27
... appear otherwise situated than they would to the same spectator , had the atmosphere no existence . It thus produces a false impression respecting their places , which must be rectified by ascertaining the amount and direction of the ...
... appear otherwise situated than they would to the same spectator , had the atmosphere no existence . It thus produces a false impression respecting their places , which must be rectified by ascertaining the amount and direction of the ...
Page 29
... appear more elevated above the horizon A H , when seen through the refracting atmosphere , than it would appear were there no such atmosphere . Since , however , the dis- position of the strata is the same in all directions around A ...
... appear more elevated above the horizon A H , when seen through the refracting atmosphere , than it would appear were there no such atmosphere . Since , however , the dis- position of the strata is the same in all directions around A ...
Page 31
... appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule ...
... appear more elevated by it above their true directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical atmosphere attraction axis bright calculation celestial circle coincidence 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 heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations phænomena phænomenon planet planetary pole portion position precession precisely proper motion proportion recede recess 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 whole zenith