Outlines of Astronomy |
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Page 2
... become en- larged in his imagination into vast globes , the one ap- proaching in magnitude to the earth itself , the other im- mensely surpassing it . The planets , which appear only as stars somewhat brighter than the rest , are to him ...
... become en- larged in his imagination into vast globes , the one ap- proaching in magnitude to the earth itself , the other im- mensely surpassing it . The planets , which appear only as stars somewhat brighter than the rest , are to him ...
Page 11
... become degraded in its application , and confined to superstitious and delusive at- tempts to divine future events by their dependence on pre- AσTηp , a star ; vouos , a law ; or veue , to tend , as a shepherd his flock ; so that ...
... become degraded in its application , and confined to superstitious and delusive at- tempts to divine future events by their dependence on pre- AσTηp , a star ; vouos , a law ; or veue , to tend , as a shepherd his flock ; so that ...
Page 19
... becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so ... become a tangent to the sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the ...
... becomes less obtuse , or , in other words , the apparent angular diameter of the earth diminishes , being nowhere so ... become a tangent to the sphere at m , as is the line xy . ( 23. ) This explains what is meant by the dip of the ...
Page 31
... becomes much more complicated in its expression . 4thly . The average amount of refraction , for an object half- way between the zenith and horizon , or at an apparent alti- tude of 45 ° , is about 1 ' ( more exactly 57 ′′ ) , a ...
... becomes much more complicated in its expression . 4thly . The average amount of refraction , for an object half- way between the zenith and horizon , or at an apparent alti- tude of 45 ° , is about 1 ' ( more exactly 57 ′′ ) , a ...
Page 44
... become actually inverted with respect to the horizon , while , on the other hand , they always turn the same points towards the pole . In short , he will perceive that the whole assemblage of stars visible at once , or in succession ...
... become actually inverted with respect to the horizon , while , on the other hand , they always turn the same points towards the pole . In short , he will perceive that the whole assemblage of stars visible at once , or in succession ...
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Common terms and phrases
amount angle angular appear apsides ascertained astronomical atmosphere attraction axis bright calculation celestial circle coincidence 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 heavens heliocentric hemisphere horizon inclination inequality instance instrument interval Jupiter latitude latter less light longitude lunar magnitude mass mean measure meridian micrometrical moon moon's nearly nebula node normal force nutation object observed orbit parallax parallel perigee perihelion period perturbations phænomena phænomenon planet planetary pole portion position precession precisely proper motion proportion recede recess 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 whole zenith