Outlines of Astronomy |
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Page viii
... ellipse is brought distinctly under inspec- tion ; and a clearness of conception introduced into the pertur- bations of the excentricities , perihelia , and epochs , which the author does not think it presumption to believe can be ...
... ellipse is brought distinctly under inspec- tion ; and a clearness of conception introduced into the pertur- bations of the excentricities , perihelia , and epochs , which the author does not think it presumption to believe can be ...
Page xii
... ellipse about the focus . Law of the angular velocity . Equable description of areas . Parallax of the Sun. Its distance and magnitude . Copernican explanation of the Sun's apparent motion . Parallelism of the Earth's axis . The seasons ...
... ellipse about the focus . Law of the angular velocity . Equable description of areas . Parallax of the Sun. Its distance and magnitude . Copernican explanation of the Sun's apparent motion . Parallelism of the Earth's axis . The seasons ...
Page 119
... ellipses ; so that , on such a shaped earth , the horizon of a spectator would nowhere ( except at the poles ) be exactly circular , bnt somewhat elliptical . It is easy to demonstrate , however , that its deviation from the circular ...
... ellipses ; so that , on such a shaped earth , the horizon of a spectator would nowhere ( except at the poles ) be exactly circular , bnt somewhat elliptical . It is easy to demonstrate , however , that its deviation from the circular ...
Page 126
... ellipse , or nearly so , having N S , the axis of the earth , for its shorter , and E F , the equatorial diameter , for its longer axis ; and that the form of the earth's surface is that which would arise from making such a curve ...
... ellipse , or nearly so , having N S , the axis of the earth , for its shorter , and E F , the equatorial diameter , for its longer axis ; and that the form of the earth's surface is that which would arise from making such a curve ...
Page 175
... ellipse of 18 " -5 in diameter , it is carried by the greater and regularly progressive motion of precession over so much of its circle round the pole of the ecliptic as corresponds to nineteen years , - that is to say , over an angle ...
... ellipse of 18 " -5 in diameter , it is carried by the greater and regularly progressive motion of precession over so much of its circle round the pole of the ecliptic as corresponds to nineteen years , - that is to say , over an angle ...
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Common terms and phrases
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 ellipse epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity greater 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 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