Outlines of astronomy |
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Page xix
... horizon and its dip . The atmosphere . Refraction . Twi- light . Appearances resulting from diurnal motion . From change of station in general . Parallactic motions . Terrestrial parallax . That of the stars insensible . First step ...
... horizon and its dip . The atmosphere . Refraction . Twi- light . Appearances resulting from diurnal motion . From change of station in general . Parallactic motions . Terrestrial parallax . That of the stars insensible . First step ...
Page 11
... HORIZON AND ITS DIP . MOSPHERE . SULTING FROM DIURNAL MOTION FROM CHANGE OF STATION PARALLACTIC MOTIONS . -TERRESTRIAL PARAL- IN GENERAL . LAX . - -- TWILIGHT . - THAT OF THE STARS INSENSIBLE . FIRST STEP TO- WARDS FORMING AN IDEA OF ...
... HORIZON AND ITS DIP . MOSPHERE . SULTING FROM DIURNAL MOTION FROM CHANGE OF STATION PARALLACTIC MOTIONS . -TERRESTRIAL PARAL- IN GENERAL . LAX . - -- TWILIGHT . - THAT OF THE STARS INSENSIBLE . FIRST STEP TO- WARDS FORMING AN IDEA OF ...
Page 16
... horizon ; and , besides , the moon and stars also set and rise again in all points of the visible horizon . The conclusion is plain : the earth cannot extend indefinitely in depth downwards , nor indefinitely in surface laterally ; it ...
... horizon ; and , besides , the moon and stars also set and rise again in all points of the visible horizon . The conclusion is plain : the earth cannot extend indefinitely in depth downwards , nor indefinitely in surface laterally ; it ...
Page 17
... horizon , the true sea - line , to be seen- the very same appearances are witnessed , but with this re- markable addition , viz . that the angular diameter of the visible area , as measured by the dip sector , is materially less than at ...
... horizon , the true sea - line , to be seen- the very same appearances are witnessed , but with this re- markable addition , viz . that the angular diameter of the visible area , as measured by the dip sector , is materially less than at ...
Page 18
... horizon ; and as this tangent sweeps round M , and comes successively into the positions MO o , MP p , M Q q , the point of contact N will mark out on the surface the circle NOPQ . The area of the spherical surface compre- Z B EA K G ...
... horizon ; and as this tangent sweeps round M , and comes successively into the positions MO o , MP p , M Q q , the point of contact N will mark out on the surface the circle NOPQ . The area of the spherical surface compre- Z B EA K G ...
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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