Outlines of Astronomy |
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Page 30
... zenith * , ( or point of the sky vertically above the spectator ) , and under all the circumstances in which astronomical observations are usually performed which may influence the result , is one of the most important and indispensable ...
... zenith * , ( or point of the sky vertically above the spectator ) , and under all the circumstances in which astronomical observations are usually performed which may influence the result , is one of the most important and indispensable ...
Page 31
... zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases to give correct results in the vicinity of the horizon , where the law becomes much more complicated in its expression . 4thly . The ...
... zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases to give correct results in the vicinity of the horizon , where the law becomes much more complicated in its expression . 4thly . The ...
Page 45
... zenith may even be discerned by the naked eye ; and we have ourselves heard it stated by a celebrated optician , that the earliest circumstance which drew his attention to astronomy was the regular appearance , at a certain hour , for ...
... zenith may even be discerned by the naked eye ; and we have ourselves heard it stated by a celebrated optician , that the earliest circumstance which drew his attention to astronomy was the regular appearance , at a certain hour , for ...
Page 51
... zenith , or as may be seen in the annexed figure , where a b , AB , ab , are three different positions of the same stars , as they would , if near the earth , be seen from I a spectator S , under the visual angles a Sb , AS B. No such ...
... zenith , or as may be seen in the annexed figure , where a b , AB , ab , are three different positions of the same stars , as they would , if near the earth , be seen from I a spectator S , under the visual angles a Sb , AS B. No such ...
Page 53
... zenith . Now , so far as appearances go , it is clearly the same thing whether the heavens , that is , all space with its contents , revolve round a spectator at rest in the earth's centre , or whether that spectator simply turn round ...
... zenith . Now , so far as appearances go , it is clearly the same thing whether the heavens , that is , all space with its contents , revolve round a spectator at rest in the earth's centre , or whether that spectator simply turn round ...
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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