Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 15
... becomes easy to imagine it in motion - or , rather , difficult to imagine it otherwise ; for , since there is nothing to retain it in one place , should any causes of motion exist , or any forces act upon it , it must obey their impulse ...
... becomes easy to imagine it in motion - or , rather , difficult to imagine it otherwise ; for , since there is nothing to retain it in one place , should any causes of motion exist , or any forces act upon it , it must obey their impulse ...
Page 18
... becomes less obtuse , or , in other words , the apparent an diameter of the earth diminishes , being nowhere so gre ... become more nearly st but will not attain perfect straightness till M is br fairly up to contact with the surface at ...
... becomes less obtuse , or , in other words , the apparent an diameter of the earth diminishes , being nowhere so gre ... become more nearly st but will not attain perfect straightness till M is br fairly up to contact with the surface at ...
Page 18
... becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so ... become more nearly straight , but will not attain perfect straightness till M is brought fairly up to contact with ...
... becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so ... become more nearly straight , but will not attain perfect straightness till M is brought fairly up to contact with ...
Page 28
... becomes visible to him , as if it stood at p , by the refracted ray P qrt A , to which A p is a tangent . ( 41. ) The exact estimation of the amount of atmospheric refraction , or the strict determination of the angle SA s , by which a ...
... becomes visible to him , as if it stood at p , by the refracted ray P qrt A , to which A p is a tangent . ( 41. ) The exact estimation of the amount of atmospheric refraction , or the strict determination of the angle SA s , by which a ...
Page 30
... becomes much more complicated in its expression . 4thly . The average amount of refraction , for an object half- way between the zenith and horizon , or at an apparent alti- tude of 45 ° , is about 1 ' ( more exactly 57 ′′ ) , a ...
... becomes much more complicated in its expression . 4thly . The average amount of refraction , for an object half- way between the zenith and horizon , or at an apparent alti- tude of 45 ° , is about 1 ' ( more exactly 57 ′′ ) , a ...
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angle angular appear apsides ascertained astronomical axis bright calculation celestial centre circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe heavens heliocentric horizon inclination inequality instance instrument interval 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 planet planetary pole portion position Post 8vo precession proper motions proportion recede recess reckoned refraction respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole Woodcuts zenith
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Page 674 - A Dictionary of Science, Literature, and Art : Comprising the History, Description, and Scientific Principles of every Branch of Human Knowledge ; with the Derivation and Definition of all the Terms in General Use. Edited by WT BRANDE, FRSL and E.