Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 17
... angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the ...
... angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the ...
Page 18
... angle N becomes less obtuse , or , in other words , the apparent an diameter of the earth diminishes , being nowhere so gre 180 ° , or two right angles , but falling short of it by some sible quantity , and that more and more the higher ...
... angle N becomes less obtuse , or , in other words , the apparent an diameter of the earth diminishes , being nowhere so gre 180 ° , or two right angles , but falling short of it by some sible quantity , and that more and more the higher ...
Page 17
... angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the ...
... angle , or render it more obtuse , this is the angle measured by the dip sector . Now , it is evident , 1st , that as the point M is more elevated above m , the point immediately below it on the sphere , the visible area , i . e . the ...
Page 18
... angle NMQ becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more ...
... angle NMQ becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more ...
Page 28
... 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 subject of physical inquiry , and one on which geometers ( from whom alone ...
... 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 subject of physical inquiry , and one on which geometers ( from whom alone ...
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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.