The Stars: A Study of the Universe |
From inside the book
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Page 89
... parallactic motion , to distinguish it from the actual motion of the star itself . The interest which attaches to the position of the solar apex has led a great number of investigators to determine it . Owing to the rather indefinite ...
... parallactic motion , to distinguish it from the actual motion of the star itself . The interest which attaches to the position of the solar apex has led a great number of investigators to determine it . Owing to the rather indefinite ...
Page 92
... parallactic motion of the stars of known parallax . Regarding any star 90 ° from the apex of the solar motion as in a state of absolute rest , we have the obvious rule that the quotient of its ... motion 92 PROPER MOTIONS OF THE STARS.
... parallactic motion of the stars of known parallax . Regarding any star 90 ° from the apex of the solar motion as in a state of absolute rest , we have the obvious rule that the quotient of its ... motion 92 PROPER MOTIONS OF THE STARS.
Page 93
... motion of its own , we can draw no conclusion from the apparent motion of any one star , owing to the impos- sibility of distinguishing its actual from its parallactic motion . We should , therefore , base our conclusion on the mean ...
... motion of its own , we can draw no conclusion from the apparent motion of any one star , owing to the impos- sibility of distinguishing its actual from its parallactic motion . We should , therefore , base our conclusion on the mean ...
Page 288
... motion in declination . In star catalogues these two motions are given , so far as practicable . Thus , altogether ... parallactic motion , being dependent on the distance or parallax of the star . As in the case of other proper motions ...
... motion in declination . In star catalogues these two motions are given , so far as practicable . Thus , altogether ... parallactic motion , being dependent on the distance or parallax of the star . As in the case of other proper motions ...
Page 289
... parallactic motion must be equal to that of the sun . We have cited Campbell's result for the speed of the solar motion , which is between 19 and 20 km . per second , or 4 radii of the earth's orbit per year . Ac- cepting this speed we ...
... parallactic motion must be equal to that of the sun . We have cited Campbell's result for the speed of the solar motion , which is between 19 and 20 km . per second , or 4 radii of the earth's orbit per year . Ac- cepting this speed we ...
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Common terms and phrases
actual Algol apical motion appear Aquila astronomers average Beta Lyræ binary systems body bright lines brighter stars brightest brilliancy catalogue celestial sphere centre century chapter cluster colour components conclusion constellation dark lines density determined direction distance double stars earth eclipses emitted equal Eta Aquila fact faint fainter follows galaxy greater Harvard Observatory heavens Herschel hydrogen hydrogen lines increase Kapteyn latter less Lick Observatory limit lucid stars mass measured Milky naked eye nearly nebula number of stars observations Observatory orbit Orion parallactic motion parallax period photographic Pickering planet pole position proper motion question R. A. Dec radial motion ratio remarkable revolving round right ascension seems seen Sirius sixth magnitude solar apex space spectra spectroscope spectroscopic binary spectrum square degrees star-density stellar supposed surface telescope temperature tion tude UNIVERS universe variable stars variation velocity visible wave-length zone
Popular passages
Page 284 - How charming is divine Philosophy! Not harsh and crabbed, as dull fools suppose, But musical as is Apollo's lute, And a perpetual feast of nectared sweets, Where no crude surfeit reigns.
Page 224 - Tis ours to trace him only in our own. He, who through vast immensity can pierce, See worlds on worlds compose one universe, Observe how system into system runs, What other planets circle other suns, What varied being peoples every star, May tell why Heaven has made us as we are.
Page 333 - The book is cleverly written and is one of the best works of its kind ever put before the public. It will be interesting to all readers, and especially to those interested in the study of science.
Page 26 - Now came still evening on, and twilight grey Had in her sober livery all things clad; Silence accompanied; for beast and bird, They to their grassy couch, these to their nests Were slunk, all but the wakeful nightingale ; She all night long her amorous descant sung , Silence was...
Page 121 - It may be glorious to write Thoughts that shall glad the two or three High souls, like those far stars that come in sight Once in a century ; — But better far it is to speak One simple word, which now and then Shall waken their free nature in the weak And friendless sons of men...
Page 262 - To God's eternal house direct the way A broad and ample road, whose dust is gold, And pavement stars...