The Stars: A Study of the Universe |
From inside the book
Results 1-5 of 51
Page 11
... measurements . The revelations of the tele- scope take us by surprise . But if we consider what the thinker alluded ... measuring the motions of the stars in the line of sight by means of the spectroscope was first pointed out by Mr. now ...
... measurements . The revelations of the tele- scope take us by surprise . But if we consider what the thinker alluded ... measuring the motions of the stars in the line of sight by means of the spectroscope was first pointed out by Mr. now ...
Page 15
... measuring the re- spective amounts of light which we receive from them . The quantity of light in such a case varies inversely as the square of the distance . This will be seen by the figure , where S represents the position of a star ...
... measuring the re- spective amounts of light which we receive from them . The quantity of light in such a case varies inversely as the square of the distance . This will be seen by the figure , where S represents the position of a star ...
Page 19
... measuring quantities of light . But even with this instrument the observer must depend upon an estimated equality of light as judged by the eye . The light from one star is in- creased or diminished in a known proportion until it ...
... measuring quantities of light . But even with this instrument the observer must depend upon an estimated equality of light as judged by the eye . The light from one star is in- creased or diminished in a known proportion until it ...
Page 20
... measured only by its effect on the optic nerve , and there is no way of measuring this effect except by estimation . Thus , all the photometer can do is to give us the means of in- creasing or diminishing the light from one star , so ...
... measured only by its effect on the optic nerve , and there is no way of measuring this effect except by estimation . Thus , all the photometer can do is to give us the means of in- creasing or diminishing the light from one star , so ...
Page 23
... measured is made to appear of equal brightness with that of the Pole Star , and the position of a Nicol prism , which brings out this equal- ity , shows the ratio between the magnitudes of the two stars . The other survey , with the ...
... measured is made to appear of equal brightness with that of the Pole Star , and the position of a Nicol prism , which brings out this equal- ity , shows the ratio between the magnitudes of the two stars . The other survey , with the ...
Other editions - View all
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...