Outlines of AstronomyLongman, Brown, Green, Longmans, 1851 - 661 стор. |
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Сторінка 42
... POLE , which appears to be the common centre of all their motions , and which alone , in the whole heavens , may be considered immoveable . Not that this point is marked by any star . It is a purely imagi- nary centre ; but there is ...
... POLE , which appears to be the common centre of all their motions , and which alone , in the whole heavens , may be considered immoveable . Not that this point is marked by any star . It is a purely imagi- nary centre ; but there is ...
Сторінка 43
... pole . In short , he will perceive that the whole assemblage of stars visible at once , or in succession , in the heavens , may be regarded as one great constellation , which seems to revolve with a uniform motion , as if it formed one ...
... pole . In short , he will perceive that the whole assemblage of stars visible at once , or in succession , in the heavens , may be regarded as one great constellation , which seems to revolve with a uniform motion , as if it formed one ...
Сторінка 44
... pole above his horizon , in which the stars never set , so there is a corresponding segment , about which the smaller circles of the more southern stars are described , in which they never rise . The stars which border upon the extreme ...
... pole above his horizon , in which the stars never set , so there is a corresponding segment , about which the smaller circles of the more southern stars are described , in which they never rise . The stars which border upon the extreme ...
Сторінка 45
... pole , perpetually above it . " Hic vertex nobis semper sublimis ; at illum Sub pedibus nox atra videt , manesque profundi . " - VIRGIL . One pole rides high , one , plunged beneath the main , Seeks the deep night , and Pluto's dusky ...
... pole , perpetually above it . " Hic vertex nobis semper sublimis ; at illum Sub pedibus nox atra videt , manesque profundi . " - VIRGIL . One pole rides high , one , plunged beneath the main , Seeks the deep night , and Pluto's dusky ...
Сторінка 45
... pole above his horizon , in which the stars never set , so there is a corresponding segment , about which the smaller circles of the more southern stars are described , in which they never rise . The stars which border upon the extreme ...
... pole above his horizon , in which the stars never set , so there is a corresponding segment , about which the smaller circles of the more southern stars are described , in which they never rise . The stars which border upon the extreme ...
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amount angle angular appear apsides ascertained astronomical axis bright calculation celestial centre circle comet curve degree described diameter difference direction disc distance disturbing 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 increase inequality instance interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's motion nearly nebula node normal force nutation object observed orbit parallax perigee perihelion period perturbations planet planetary pole portion position Post 8vo precession proper motion proportion recede recess refraction remarkable respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole Woodcuts zenith