Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 24
... amount of this additional relief , or the ponderable quantity of air surmounted , would be by no means in pro- portion to the additional height ascended , but in a constantly decreasing ratio . An easy calculation , however , founded on ...
... amount of this additional relief , or the ponderable quantity of air surmounted , would be by no means in pro- portion to the additional height ascended , but in a constantly decreasing ratio . An easy calculation , however , founded on ...
Page 26
... their places , which must be rectified by ascertaining the amount and direction of the displacement so apparently produced on each , before we can come at a knowledge of the true directions in 26 OUTLINES OF ASTRONOMY .
... their places , which must be rectified by ascertaining the amount and direction of the displacement so apparently produced on each , before we can come at a knowledge of the true directions in 26 OUTLINES OF ASTRONOMY .
Page 28
... amount of atmospheric refraction , or the strict determination of the angle SA s , by which a celestial object at any assigned altitude , HA S , is raised in appearance above its true place , is , unfortunately , a very difficult ...
... amount of atmospheric refraction , or the strict determination of the angle SA s , by which a celestial object at any assigned altitude , HA S , is raised in appearance above its true place , is , unfortunately , a very difficult ...
Page 29
... amount of this diminution at different heights , is not yet fully ascertained . Moreover , the refracting power of air is perceptibly affected by its moisture ; and this , too , is not the same in every part of an aërial column ...
... amount of this diminution at different heights , is not yet fully ascertained . Moreover , the refracting power of air is perceptibly affected by its moisture ; and this , too , is not the same in every part of an aërial column ...
Page 30
... 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 quantity hardly sensible to the naked eye ; but at the visible horizon it amounts ...
... 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 quantity hardly sensible to the naked eye ; but at the visible horizon it amounts ...
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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.