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" Hertzsprung — and many of the facts which will be brought before you are not new ; but the observational material here presented is, I believe, much more extensive than has hitherto been assembled. We can only determine the real brightness of a star... "
Popular Astronomy - Page 284
1914
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Publications of the American Astronomical Society, Volume 3

American Astronomical Society - 1918 - 416 pages
...stars. These have been discussed by many investigators,—notably by Kapteyn and Hertzsprung,—and many of the facts which will be brought before you...is the absolute magnitude, according to Kapteyn's definition,—that is, the visual magnitude which each star would appear to have if it should be brought...
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Modern Theories of the Universe: From Herschel to Hubble

Michael J. Crowe - 1994 - 468 pages
...evidence which, converging from several quarters, affords apparently a secure basis for this belief.[1] Having thus made a rapid survey of the general field,...standard distance, corresponding to a parallax of 0".l (no account being taken of any possible absorption of light in space.) 1 [Seven pages of Russell's...
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