Outlines of Astronomy |
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Page 18
... considerable size , become enlarged in his imagi- nation into vast globes , the one approaching in magnitude to the earth itself , the other immensely surpassing it . The planets , which appear only as stars somewhat brighter than the ...
... considerable size , become enlarged in his imagi- nation into vast globes , the one approaching in magnitude to the earth itself , the other immensely surpassing it . The planets , which appear only as stars somewhat brighter than the ...
Page 21
... considerable branch of science entirely or chiefly by the way of illustration and familiar parallels , it is yet not impossible that those who are already well acquainted with our subject , and whose knowledge has been acquired by that ...
... considerable branch of science entirely or chiefly by the way of illustration and familiar parallels , it is yet not impossible that those who are already well acquainted with our subject , and whose knowledge has been acquired by that ...
Page 28
... considerable with respect to ourselves and to that small portion of it which we can see at a single view , to allow of our forming any judgment of the form of the whole , from that of a part so disfigured . But with the surface of the ...
... considerable with respect to ourselves and to that small portion of it which we can see at a single view , to allow of our forming any judgment of the form of the whole , from that of a part so disfigured . But with the surface of the ...
Page 34
... earth's surface , is that of five miles to 8000 , or 1 to 1600. The portion visible from Etna , the Peak of Teneriffe , or Mowna Roa , is about one 4000th . ( 33. ) When we ascend to any very considerable 34 OUTLINES OF ASTRONOMY .
... earth's surface , is that of five miles to 8000 , or 1 to 1600. The portion visible from Etna , the Peak of Teneriffe , or Mowna Roa , is about one 4000th . ( 33. ) When we ascend to any very considerable 34 OUTLINES OF ASTRONOMY .
Page 35
John Frederick William Herschel. ( 33. ) When we ascend to any very considerable elevation above the surface of the earth , either in a balloon , or on mountains , we are made aware , by many uneasy sensations , of an insufficient supply ...
John Frederick William Herschel. ( 33. ) When we ascend to any very considerable elevation above the surface of the earth , either in a balloon , or on mountains , we are made aware , by many uneasy sensations , of an insufficient supply ...
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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