Outlines of astronomy |
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Page xx
... axis . The seasons . Heat received from the Sun in different parts of the orbit . Effect of excentricity of the orbit and position of its axis on climate . Mean and true longitudes of the Sun. Equation of the center . Sidereal ...
... axis . The seasons . Heat received from the Sun in different parts of the orbit . Effect of excentricity of the orbit and position of its axis on climate . Mean and true longitudes of the Sun. Equation of the center . Sidereal ...
Page xxii
... AXES , PERIHELIA , AND EXCENTRICITIES . Variation of elements in general . Distinction between periodic and secular variations . Geometrical expression of tangential and normal forces . Variation 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 . Variation of the Major Axis produced only by the ...
Page 40
... 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 relative position as ...
... 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 relative position as ...
Page 41
... axis about which it is at any moment revolving shall hold no fixed places on the surface , but shift upon it every moment . Such changes , however , are inconsistent with the idea of a rotation of a body of regular figure about its axis ...
... axis about which it is at any moment revolving shall hold no fixed places on the surface , but shift upon it every moment . Such changes , however , are inconsistent with the idea of a rotation of a body of regular figure about its axis ...
Page 47
... axis , every star describing half its diurnal circle above and half beneath his horizon , re- maining alternately visible for twelve hours , and concealed during the same interval . In this situation , no part of the heavens is ...
... axis , every star describing half its diurnal circle above and half beneath his horizon , re- maining alternately visible for twelve hours , and concealed during the same interval . In this situation , no part of the heavens is ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical attraction axis bright calculation celestial circle comet curve described diameter difference direction disc distance disturbed body disturbing force diurnal diurnal motion double stars earth ecliptic Edition effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Julian period 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 phænomena planet planetary pole portion position precession proper motions proportion recede reckoned refraction remarkable respect result revolution revolving right ascension rotation round satellites Saturn seen sidereal sidereal day situation solar sphere spherical stars station sun's suppose surface syzygies tangential force telescope tion Uranus variation velocity visible vols whole zenith