Outlines of AstronomyBlanchard & Lea, 1856 - 557 стор. |
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Сторінка xiv
... AXES , PERIHELIA , AND EXCENTRICITIES . Variation of elements in general . Distinction between periodic and secular variations . Geometrical expression of tangential and normal forces . Varia- tion of the Major Axis produced only by the ...
... AXES , PERIHELIA , AND EXCENTRICITIES . Variation of elements in general . Distinction between periodic and secular variations . Geometrical expression of tangential and normal forces . Varia- tion of the Major Axis produced only by the ...
Сторінка 47
... 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 that every thing will then be in precisely the same rela- tive position ...
... 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 that every thing will then be in precisely the same rela- tive position ...
Сторінка 48
... axis of symmetry , performed in free space , and without resistance or obstruction from any surrounding medium , or disturbing influences . The complete absence of such obstructions draws with it , of necessity , the strict fulfil- ment ...
... axis of symmetry , performed in free space , and without resistance or obstruction from any surrounding medium , or disturbing influences . The complete absence of such obstructions draws with it , of necessity , the strict fulfil- ment ...
Сторінка 52
... axis , in short , about which the diurnal motion is performed , will appear to have become continually less and less inclined to the horizon ; and by the same degrees as the northern pole is depressed the southern will rise , and ...
... axis , in short , about which the diurnal motion is performed , will appear to have become continually less and less inclined to the horizon ; and by the same degrees as the northern pole is depressed the southern will rise , and ...
Сторінка 54
... axis or line of reference , and assume new positions , BP p , BQq , revolving round their respective objects as centres . Their intersections , therefore , p , q , with our visual sphere , will appear to recede on its surface , but with ...
... axis or line of reference , and assume new positions , BP p , BQq , revolving round their respective objects as centres . Their intersections , therefore , p , q , with our visual sphere , will appear to recede on its surface , but with ...
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Outlines of Astronomy John Frederick William Herschel,Sir John Frederick William Herschel Повний перегляд - 1851 |
Загальні терміни та фрази
altitude amount angle angular appear apsides ascertained astronomers 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 effect elements ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric horizon inclination increase 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 perpendicular perturbations planet planetary pole portion position precession proper motions proportion recede recess reckoned refraction remarkable render respect result revolution right ascension rotation round satellites Saturn seen sidereal sidereal day sidereal period situation solar sphere spherical stars station sun's suppose syzygies tangential force telescope tion Uranus variation velocity visible whole zenith