Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page xi
... circle . The Meridian circle . Fixation of polar and horizontal points . The level , plumb- line , artificial horizon . Principle of collimation . Collimators of Rittenhouse , Kater , and Benzenberg . Of compound instruments with co ...
... circle . The Meridian circle . Fixation of polar and horizontal points . The level , plumb- line , artificial horizon . Principle of collimation . Collimators of Rittenhouse , Kater , and Benzenberg . Of compound instruments with co ...
Page 16
... circle , having our station for its centre . That this line is really a circle , we conclude , first , from the perfect apparent similarity of all its parts ; and , secondly , from the fact of all its parts appearing at the same ...
... circle , having our station for its centre . That this line is really a circle , we conclude , first , from the perfect apparent similarity of all its parts ; and , secondly , from the fact of all its parts appearing at the same ...
Page 17
... circle NOPQ . The area of the spherical surface compre- 2 M B F A k K G hended within this circle is the portion of the earth's surface visible to a spectator at M , and the angle N M Q included between the two extreme visual rays is ...
... circle NOPQ . The area of the spherical surface compre- 2 M B F A k K G hended within this circle is the portion of the earth's surface visible to a spectator at M , and the angle N M Q included between the two extreme visual rays is ...
Page 17
... circle NOPQ . The area of the spherical surface compreB 10 C 2 M D " Opigw , to terminate , F A hended within this circle is the portion of the earth's surface visible to a spectator at M , and the angle N M Q included between the two ...
... circle NOPQ . The area of the spherical surface compreB 10 C 2 M D " Opigw , to terminate , F A hended within this circle is the portion of the earth's surface visible to a spectator at M , and the angle N M Q included between the two ...
Page 34
... circle below than above . This singular effect , which any one may notice in a fine sunset , arises from the rapid rate at which the refraction increases in approach- ing the horizon . Were every visible point in the sun's cir ...
... circle below than above . This singular effect , which any one may notice in a fine sunset , arises from the rapid rate at which the refraction increases in approach- ing the horizon . Were every visible point in the sun's cir ...
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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.