Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 25
... proportion to the globe on which it rests , than the downy skin of a peach in comparison with the fruit within it ) , all sensible trace of the existence of air dis- appears . ( 36. ) Arguments , however , are not wanting to render it ...
... proportion to the globe on which it rests , than the downy skin of a peach in comparison with the fruit within it ) , all sensible trace of the existence of air dis- appears . ( 36. ) Arguments , however , are not wanting to render it ...
Сторінка 30
... proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases to give correct results in the vicinity of the horizon ...
... proportion to the tangent of the apparent angular distance of the object from the zenith . But this rule , which is not far from the truth , at moderate zenith distances , ceases to give correct results in the vicinity of the horizon ...
Сторінка 42
... proportion of the visible segment of their diurnal circles to their whole circumferences . Both go on increasing ; they remain in view more than twelve hours , and their visible diurnal arcs are more than semicircles . But the ...
... proportion of the visible segment of their diurnal circles to their whole circumferences . Both go on increasing ; they remain in view more than twelve hours , and their visible diurnal arcs are more than semicircles . But the ...
Сторінка 44
... proportion to the power of the instrument , not only the largest and brightest of them , but even those of inferior lustre , such as scarcely strike the eye at night as at all conspicuous , are readily found and followed even at noon ...
... proportion to the power of the instrument , not only the largest and brightest of them , but even those of inferior lustre , such as scarcely strike the eye at night as at all conspicuous , are readily found and followed even at noon ...
Сторінка 45
... proportion as he advances to the south , some of those con- stellations which , at his original station , barely grazed the northern horizon , will be observed to sink below it and set ; at first remaining hid only for a very short time ...
... proportion as he advances to the south , some of those con- stellations which , at his original station , barely grazed the northern horizon , will be observed to sink below it and set ; at first remaining hid only for a very short time ...
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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.