Outlines of astronomy |
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Page xvi
... mean elevations of the surfaces of the continents , but those of the centers of gravity of their masses , and are therefore only the halves of the mean heights of the upper surfaces . LIST OF PLATES . PLATE I. Frontispiece . Fig .
... mean elevations of the surfaces of the continents , but those of the centers of gravity of their masses , and are therefore only the halves of the mean heights of the upper surfaces . LIST OF PLATES . PLATE I. Frontispiece . Fig .
Page xvi
... mean elevations of the surfaces of the continents , but those of the centers of gravity of their masses , and are therefore only the halves of the mean heights of the upper surfaces . LIST OF PLATES . PLATE L. Frontispiece . Fig .
... mean elevations of the surfaces of the continents , but those of the centers of gravity of their masses , and are therefore only the halves of the mean heights of the upper surfaces . LIST OF PLATES . PLATE L. Frontispiece . Fig .
Page 31
... mean state , the amount of refraction is greater than its mean amount ; when lower , less : and , 6thly . That for one and the same reading of the barometer the refraction is greater , the colder the air . The variations , owing to ...
... mean state , the amount of refraction is greater than its mean amount ; when lower , less : and , 6thly . That for one and the same reading of the barometer the refraction is greater , the colder the air . The variations , owing to ...
Page 80
... mean or average of the results obtained , this class of errors may be so far subdued , by setting them to destroy ... means of de- tection of all mechanical defects which elude by their mi- nuteness every other mode of detection . What ...
... mean or average of the results obtained , this class of errors may be so far subdued , by setting them to destroy ... means of de- tection of all mechanical defects which elude by their mi- nuteness every other mode of detection . What ...
Page 83
... mean , which is one of the chief modes by which precision is attained in practical astronomy . Suppose , for example , the principle of an instrument required that a circle should be concentric with the axis on which it is made to turn ...
... mean , which is one of the chief modes by which precision is attained in practical astronomy . Suppose , for example , the principle of an instrument required that a circle should be concentric with the axis on which it is made to turn ...
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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