Outlines of Astronomy |
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Page xii
... orbit an 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 ...
... orbit an 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 ...
Page xiii
... orbit by gravity . Its law of diminution . Laws of elliptic motion . Orbit of the Earth round the Sun in accordance with these laws . Masses of the Earth and Sun compared . Density of the Sun. Force of gravity at its surface ...
... orbit by gravity . Its law of diminution . Laws of elliptic motion . Orbit of the Earth round the Sun in accordance with these laws . Masses of the Earth and Sun compared . Density of the Sun. Force of gravity at its surface ...
Page 186
... orbit . ( 348. ) This variation of its angular velocity is accompanied with a corresponding change of its distance from us . The change of distance is recognized by a variation observed to take place in its apparent diameter , when ...
... orbit . ( 348. ) This variation of its angular velocity is accompanied with a corresponding change of its distance from us . The change of distance is recognized by a variation observed to take place in its apparent diameter , when ...
Page 187
... orbit of the sun about the earth . Now , when this is done , a deviation from the circular figure in the resulting curve becomes apparent ; it is found to be evidently longer than it is broad - that is to say , elliptic , and the point ...
... orbit of the sun about the earth . Now , when this is done , a deviation from the circular figure in the resulting curve becomes apparent ; it is found to be evidently longer than it is broad - that is to say , elliptic , and the point ...
Page 188
... orbit , by a direct comparison of angles and distances , but requires an attentive consideration of the whole series of observations registered during an entire period . It was not , therefore , without much painful and laborious ...
... orbit , by a direct comparison of angles and distances , but requires an attentive consideration of the whole series of observations registered during an entire period . It was not , therefore , without much painful and laborious ...
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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