Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 pages |
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Page 21
John Frederick William Herschel. R for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measurement ... equal to = 4 x 2112 8448 , or , in round c 3 SIZE OF THE EARTH . 21.
John Frederick William Herschel. R for simplicity , we will suppose to be exactly equal ) are known , as well as their exact horizontal interval a Db , by measurement ... equal to = 4 x 2112 8448 , or , in round c 3 SIZE OF THE EARTH . 21.
Page 23
... equal to the perpendicular elevation of the point of sight above the surface . The proportion , therefore , of the visible area , in this case , to the whole earth's surface , is that of five miles to 8000 , or 1 to 1600. The portion ...
... equal to the perpendicular elevation of the point of sight above the surface . The proportion , therefore , of the visible area , in this case , to the whole earth's surface , is that of five miles to 8000 , or 1 to 1600. The portion ...
Page 39
... equal intervals of time , ad infinitum . ( 55. ) Now , in this we have a lively picture of that grand phenomenon , the most important beyond all comparison which nature presents , the daily rising and setting of the sun and stars ...
... equal intervals of time , ad infinitum . ( 55. ) Now , in this we have a lively picture of that grand phenomenon , the most important beyond all comparison which nature presents , the daily rising and setting of the sun and stars ...
Page 49
... equal to the sum of the interior and opposite , D B P = DAP AP B , whence DBP - DAP AP B. = ( 71. ) It follows from what has been said that the amount of parallactic motion arising from any given change of our point of view is , cæteris ...
... equal to the sum of the interior and opposite , D B P = DAP AP B , whence DBP - DAP AP B. = ( 71. ) It follows from what has been said that the amount of parallactic motion arising from any given change of our point of view is , cæteris ...
Page 70
... equal to the lati- tude of the spectator's geographical station . For it appears , see fig . art . 112. , that the angle PAZ be- tween the pole and the zenith is equal to N C A , and the angles Z An and NCE being right angles , we have ...
... equal to the lati- tude of the spectator's geographical station . For it appears , see fig . art . 112. , that the angle PAZ be- tween the pole and the zenith is equal to N C A , and the angles Z An and NCE being right angles , we have ...
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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.