Outlines of astronomy |
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Page xxiii
... round each other . Describe elliptic orbits under the Newtonian law of gravity . Elements of orbits of several . Actual dimensions of their orbits . Coloured double stars . Phæno- menon of complementary colours . Sanguine stars . Proper ...
... round each other . Describe elliptic orbits under the Newtonian law of gravity . Elements of orbits of several . Actual dimensions of their orbits . Coloured double stars . Phæno- menon of complementary colours . Sanguine stars . Proper ...
Page 16
... round a very large extent of the 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 ...
... round a very large extent of the 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 ...
Page 22
... is to the height of each as 4 × 528 or 2112 : 1 , and therefore in the same proportion to 4 miles is the length of the earth's diameter . It must , therefore , be equal to 4 × 2112 = 8448 , or , in round 22 OUTLINES OF ASTRONOMY .
... is to the height of each as 4 × 528 or 2112 : 1 , and therefore in the same proportion to 4 miles is the length of the earth's diameter . It must , therefore , be equal to 4 × 2112 = 8448 , or , in round 22 OUTLINES OF ASTRONOMY .
Page 37
... round the corner ; but the zone thus added to his visual range can hardly ever , unless in very extraordinary circumstances , exceed a couple of degrees in breadth , and is always ill seen on account of the vapours near the horizon ...
... round the corner ; but the zone thus added to his visual range can hardly ever , unless in very extraordinary circumstances , exceed a couple of degrees in breadth , and is always ill seen on account of the vapours near the horizon ...
Page 38
... round the sphere , sinks in succession beneath them . The novelty and splendour of fresh constellations thus gra- B dually brought into view in the clear calm nights of tropical climates , in long voyages to the south , is dwelt upon by ...
... round the sphere , sinks in succession beneath them . The novelty and splendour of fresh constellations thus gra- B dually brought into view in the clear calm nights of tropical climates , in long voyages to the south , is dwelt upon by ...
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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