The System of the Stars |
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Page 20
... reason from distance to brightness only by wide averages . A statistical method alone is available , and its employment involves the establish- ment of strict principles of light measurement . The first requisite for this purpose was an ...
... reason from distance to brightness only by wide averages . A statistical method alone is available , and its employment involves the establish- ment of strict principles of light measurement . The first requisite for this purpose was an ...
Page 24
... reasons a photographic telescope has , as a rule , a guiding telescope attached to its axis , through which an observer watches to counteract , almost to anticipate , nascent tendencies to dis- placement . The strain upon the attention ...
... reasons a photographic telescope has , as a rule , a guiding telescope attached to its axis , through which an observer watches to counteract , almost to anticipate , nascent tendencies to dis- placement . The strain upon the attention ...
Page 32
... reason useless in ordinary observation . The images they give are wholly built up out of blue light , while the light proper for seeing by wanders unserviceably astray . Hence the plates exposed with them must be of an approximately ...
... reason useless in ordinary observation . The images they give are wholly built up out of blue light , while the light proper for seeing by wanders unserviceably astray . Hence the plates exposed with them must be of an approximately ...
Page 33
... Reason- ing is therefore cramped in cautious minds , or left to run wild in impatient ones , for lack of data . They are needed to wing thought in the one case , to restrain it in the other . And by photography alone it would seem that ...
... Reason- ing is therefore cramped in cautious minds , or left to run wild in impatient ones , for lack of data . They are needed to wing thought in the one case , to restrain it in the other . And by photography alone it would seem that ...
Page 35
... reason , since its efficiency as a radiator depends upon the perpetuation of the condensing process by which this brilliant surface is produced . The possession of a photosphere must then be regarded as an essential feature of the suns ...
... reason , since its efficiency as a radiator depends upon the perpetuation of the condensing process by which this brilliant surface is produced . The possession of a photosphere must then be regarded as an essential feature of the suns ...
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Common terms and phrases
61 Cygni 70 Ophiuchi absorption Aldebaran Algol Andromeda Andromeda nebula appear Arcturus Argûs Astr astronomy atmospheric bands Betelgeux blue bodies bright lines brilliant Cassiopeia Catalogue centre century cluster colour comets condensation Cygni dark detected distance double stars effect extent faint galactic Harvard heavens heliometer hence Huggins hydrogen hydrogen lines Ibid interval less light Lockyer luminous lustre Lyræ magnitude star mass maximum measured ment miles Milky Mira Monthly Notices movements nearly nebula ninth magnitude objects observations Observatory Ophiuchus orbit Orion Orion nebula pair parallax peculiarities period Phil photographic photosphere planetary plates Pleiades present Professor proper motion rays red stars refractor remarkable remote satellite Schjellerup seems sidereal Sir John Herschel Sirian Sirius sixth magnitude small stars solar southern space spectra spectroscopic spectrum stellar Struve sun's telescope tion Trans variable stars velocity visible visual Vogel yellow
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