Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 189
... epoch , by the most direct of all astrono mical observations , those with the meridian or mural circle . By this instrument we are enabled to ascertain at every moment the exact distance of the polar point from any three or more stars ...
... epoch , by the most direct of all astrono mical observations , those with the meridian or mural circle . By this instrument we are enabled to ascertain at every moment the exact distance of the polar point from any three or more stars ...
Сторінка 191
... , are easily distinguished from that general and systematic alteration which a shifting of the axis of rotation would give rise to . sent epoch , the longitudes of all the stars were THE POLE STAR NOT ALWAYS THE SAME . 191.
... , are easily distinguished from that general and systematic alteration which a shifting of the axis of rotation would give rise to . sent epoch , the longitudes of all the stars were THE POLE STAR NOT ALWAYS THE SAME . 191.
Сторінка 192
... epoch . And the latitude of Gizeh being just 30 ° north , and consequently the altitude of the north pole there also 30 ° , it follows that the star in question must have had at its lower culmination , at Gizeh , an altitude of 26 ° 15 ...
... epoch . And the latitude of Gizeh being just 30 ° north , and consequently the altitude of the north pole there also 30 ° , it follows that the star in question must have had at its lower culmination , at Gizeh , an altitude of 26 ° 15 ...
Сторінка 194
... epoch we intend , and whether we mean the mean right ascension - cleared , that is , of the periodical fluctuation in its amount , which arises from nutation , or the apparent right ascension , which , being reckoned from the actual ...
... epoch we intend , and whether we mean the mean right ascension - cleared , that is , of the periodical fluctuation in its amount , which arises from nutation , or the apparent right ascension , which , being reckoned from the actual ...
Сторінка 206
... epoch , must be in the inverse proportion of the apparent diameters . It appears , therefore , that the greatest , the mean , and the least distances of the sun from us are in the respective proportions of the numbers 1.01679 , 1 ...
... epoch , must be in the inverse proportion of the apparent diameters . It appears , therefore , that the greatest , the mean , and the least distances of the sun from us are in the respective proportions of the numbers 1.01679 , 1 ...
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
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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Сторінка 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.