Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 28
... direction which the visual ray has at the instant of arriving at the eye , without regard to what may have been ... directions around A , the visual ray will not be made to deviate laterally , but will remain constantly in the same ...
... direction which the visual ray has at the instant of arriving at the eye , without regard to what may have been ... directions around A , the visual ray will not be made to deviate laterally , but will remain constantly in the same ...
Сторінка 30
... direction , as if there were no atmosphere , at least if the air be tranquil . 2dly . In descending from the zenith ... directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of ...
... direction , as if there were no atmosphere , at least if the air be tranquil . 2dly . In descending from the zenith ... directions than those at a high altitude . 3dly . The rate of its increase is nearly in proportion to the tangent of ...
Сторінка 34
... direction . When very near the hori- zon , this flattening is evidently more considerable on the lower side than on ... directions , so that its apparent length remains the same . The dilated size ( generally ) of the sun or moon , when ...
... direction . When very near the hori- zon , this flattening is evidently more considerable on the lower side than on ... directions , so that its apparent length remains the same . The dilated size ( generally ) of the sun or moon , when ...
Сторінка 39
... direction , that is to say , to be per- formed round one and the same axis , till it has completed an entire revolution , and come back to the position from which it set out when the spectator began his observations , —it is manifest ...
... direction , that is to say , to be per- formed round one and the same axis , till it has completed an entire revolution , and come back to the position from which it set out when the spectator began his observations , —it is manifest ...
Сторінка 48
... direction in which he moves : but let him withdraw his eye from that object , and fix it on another , a nearer one , for instance , immediately the appearance of rotation shifts also , and the apparent centre about which this illusive ...
... direction in which he moves : but let him withdraw his eye from that object , and fix it on another , a nearer one , for instance , immediately the appearance of rotation shifts also , and the apparent centre about which this illusive ...
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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.