Outlines of AstronomyLongman, green and Roberts, 1859 - 714 pages |
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Page xx
... 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 . Heat received from the Sun in ...
... 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 . Heat received from the Sun in ...
Page 18
... angular diameter . Leaving , at present , out of con- sideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this ...
... angular diameter . Leaving , at present , out of con- sideration the effect of refraction in the air below M , of which more hereafter , and which always tends , in some degree , to increase that angle , or render it more obtuse , this ...
Page 19
... angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more and more the higher we ascend . The figure exhibits three states or ...
... angular diameter of the earth diminishes , being nowhere so great as 180 ° , or two right angles , but falling short of it by some sen- sible quantity , and that more and more the higher we ascend . The figure exhibits three states or ...
Page 49
... angular velocity in pro- portion to their proximity ; the same distance of advance A B subtending a greater angle , APB = c P p , at the near object P than at the remote one Q. ( 69. ) A consequence of the familiar appearance we have ...
... angular velocity in pro- portion to their proximity ; the same distance of advance A B subtending a greater angle , APB = c P p , at the near object P than at the remote one Q. ( 69. ) A consequence of the familiar appearance we have ...
Page 50
... angular motion of an object , arising from a change of our point of view , is called in general paral- lax , and it is always expressed by the angle A P B subtended at the object P ( see fig . of art . 68. ) by a line joining the two ...
... angular motion of an object , arising from a change of our point of view , is called in general paral- lax , and it is always expressed by the angle A P B subtended at the object P ( see fig . of art . 68. ) by a line joining the two ...
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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 effect epoch equal equator equinoctial equinox error exact excentricity fixed globe gravity heavens heliocentric hemisphere 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 perturbations phænomena planet planetary pole portion position precession precisely proper motions proportion recede recess reckoned refraction remarkable render respect result revolution revolving right ascension ring 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 whole zenith