Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 31
... actual material atoms of the air itself . To understand how this takes place , we must recollect , that it is not only by the direct light of a luminous object that we see , but that whatever portion of its light which would not ...
... actual material atoms of the air itself . To understand how this takes place , we must recollect , that it is not only by the direct light of a luminous object that we see , but that whatever portion of its light which would not ...
Сторінка 34
... Actual measurement with a proper in- strument corrects our error , without , however , dispelling our illusion . By this we learn , that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a ...
... Actual measurement with a proper in- strument corrects our error , without , however , dispelling our illusion . By this we learn , that the sun , when just on the horizon , subtends at our eyes almost exactly the same , and the moon a ...
Сторінка 35
... actual apparent proportions , and the likeness is not taxed with in- correctness , though a man in the foreground should be re- presented larger than a mountain in the distance . So it is to a spectator of the heavenly bodies pictured ...
... actual apparent proportions , and the likeness is not taxed with in- correctness , though a man in the foreground should be re- presented larger than a mountain in the distance . So it is to a spectator of the heavenly bodies pictured ...
Сторінка 38
... actual change of place . Yet , with respect to external objects , that is to say , all celestial ones which do not participate in the supposed rotation of the earth , —his horizon will have been all the while shifting in its relation to ...
... actual change of place . Yet , with respect to external objects , that is to say , all celestial ones which do not participate in the supposed rotation of the earth , —his horizon will have been all the while shifting in its relation to ...
Сторінка 70
... actual situations in space , which it is the business of astro- nomy to arrive at by appropriate considerations . But the connections which subsist among the several parts of the pic- ture , the purely geometrical relations among the ...
... actual situations in space , which it is the business of astro- nomy to arrive at by appropriate considerations . But the connections which subsist among the several parts of the pic- ture , the purely geometrical relations among the ...
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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.