Star Atlas, Containing Stars Visible to the Naked Eye And Clusters, Nebulae And Double Stars Visible in Small Telescopes, Together With Variable Stars, Red Stars, Characteristic Star Groups, Ancient Constellation Figures And An Explanatory Text
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In our eReader you can find the full English version of the book. Read Star Atlas, Containing Stars Visible to the Naked Eye And Clusters, Nebulae And Double Stars Visible in Small Telescopes, Together With Variable Stars, Red Stars, Characteristic Star Groups, Ancient Constellation Figures And An Explanatory Text Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Star Atlas, Containing Stars Visible to the Naked Eye And Clusters, Nebulae And Double Stars Visible in Small Telescopes, Together With Variable Stars, Red Stars, Characteristic Star Groups, Ancient Constellation Figures And An Explanatory Text
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This rough classification has been made the basis of the more accurate classification which modern astronomy requires. It was found that the several orders of magnitude estimated by various astronomers differed by a light ratio very nearly 2h That is, a star of the third magnitude gives 1\ times as much light as one of the fourth magnitude ; one of the fourth 2\ times as much light as one of the fifth magnitude, and so on. Modern photometric researches are made upon the assumption of this const...ant light ratio (the adopted ratio is 2.512 or -\/l00)- In this way the modern treatment of the subject of the brightness of the stars is simply a refinement in method, but with no change of plan from that followed by the earlier astronomers and their successors. Since the stars are of every degree of brightness, the gradations are expressed upon a numerical scale, with fractions of a magnitude expressed decimally. Thus, 61 Cygni, which is near the dividing line between a star of the fifth and one of the sixth magnitude, is now given as of the 5.6 magnitude.
What to read after Star Atlas, Containing Stars Visible to the Naked Eye And Clusters, Nebulae And Double Stars Visible in Small Telescopes, Together With Variable Stars, Red Stars, Characteristic Star Groups, Ancient Constellation Figures And An Explanatory Text?
You can find similar books in the "Read Also" column, or choose other free books by Winslow Upton to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This rough classification has been made the basis of the more accurate classification which modern astronomy requires. It was found that the several orders of magnitude estimated by various astronomers differed by a light ratio very nearly 2h That is, a star of the third magnitude gives 1\ times as much light as one of the fourth magnitude ; one of the fourth 2\ times as much light as one of the fifth magnitude, and so on. Modern photometric researches are made upon the assumption of this const...ant light ratio (the adopted ratio is 2.512 or -\/l00)- In this way the modern treatment of the subject of the brightness of the stars is simply a refinement in method, but with no change of plan from that followed by the earlier astronomers and their successors. Since the stars are of every degree of brightness, the gradations are expressed upon a numerical scale, with fractions of a magnitude expressed decimally. Thus, 61 Cygni, which is near the dividing line between a star of the fifth and one of the sixth magnitude, is now given as of the 5.6 magnitude.
What to read after Star Atlas, Containing Stars Visible to the Naked Eye And Clusters, Nebulae And Double Stars Visible in Small Telescopes, Together With Variable Stars, Red Stars, Characteristic Star Groups, Ancient Constellation Figures And An Explanatory Text?
You can find similar books in the "Read Also" column, or choose other free books by Winslow Upton to read onlineMoreLess
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