Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 5
... telescope , and some other of the simpler instruments . Of course , the more of such knowledge he brings to the perusal , the easier will be his progress , and the more com- plete the information gained ; but we shall endeavour in every ...
... telescope , and some other of the simpler instruments . Of course , the more of such knowledge he brings to the perusal , the easier will be his progress , and the more com- plete the information gained ; but we shall endeavour in every ...
Page 44
... telescopes in the day- time ; and , in proportion to the power of the instrument , not only the largest and brightest ... telescope accurately to the proper places . Indeed , from the bottoms of deep narrow pits , such as a well , or the ...
... telescopes in the day- time ; and , in proportion to the power of the instrument , not only the largest and brightest ... telescope accurately to the proper places . Indeed , from the bottoms of deep narrow pits , such as a well , or the ...
Page 75
... telescopes to the purposes of an- gular measurement , every imperfection of structure of divi- sion becomes magnified by the whole optical power of that instrument ; and that thus , not only direct errors of work- manship , arising from ...
... telescopes to the purposes of an- gular measurement , every imperfection of structure of divi- sion becomes magnified by the whole optical power of that instrument ; and that thus , not only direct errors of work- manship , arising from ...
Page 90
... telescope most commonly used in astronomy for these purposes is the refracting telescope , which consists of an object - glass ( either single , or as is now almost universal , double , forming what is called in optics , an achromatic ...
... telescope most commonly used in astronomy for these purposes is the refracting telescope , which consists of an object - glass ( either single , or as is now almost universal , double , forming what is called in optics , an achromatic ...
Page 91
... telescope . And it is evident , that the situation of this line holds a fixed relation to the tube and its appendages , so long as the object and eye - glasses maintain their fixity in this respect . ( 156. ) Whatever distant object E ...
... telescope . And it is evident , that the situation of this line holds a fixed relation to the tube and its appendages , so long as the object and eye - glasses maintain their fixity in this respect . ( 156. ) Whatever distant object E ...
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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.