File:Astronomy for high schools and colleges (1881) (14783736503).jpg

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Identifier: astronomyforhigh00newc (find matches)
Title: Astronomy for high schools and colleges
Year: 1881 (1880s)
Authors: Newcomb, Simon, 1835-1909 Holden, Edward Singleton, 1846-1914, joint author
Subjects: Astronomy
Publisher: New York, H. Holt and Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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t3C5 0Cii--OOOCOQQO*^*>.«OCX)-;2-3»-pH-COtO
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BRI0HTNES8 OF THE STARS. 439 that the brightness of an average star of the first magnitude isabout 0-5 of that of a Jjyrm. A star of the 2d magnitude will shinewith a light expressed by 0-5x0-4=0-20, and so on. The total brightness of 10 1st magnitude b37 2d 122 3d 310 4th 1,016 5th 4,322 6th 13,593 7th 57,960 8th ars IS Sum = 142 It thus appears that from the stars to the 8th magnitude, inclu-sive, we receive 143 times as much light as from a Lyra, a Lyrmhas been determined by Zollner to be about 44,000,000,000 timesfainter than the sun, so that the proportion of starlight to sunlightcan be computed. It also appears that the stars of magnitudes toohigh to allow them to be individually visible to the naked eye areyet so numerous as to affect the general brightness of the sky morethan the so-called lucid stars (lst-6th magnitude). B1 CHAPTER II. VARIABI4B AND TEMPORARY STARS.§ 1. STARS REGULARLY VARIABLE. All stars do not shine with a constant light. Sincethe middle of the seventeenth

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  • bookid:astronomyforhigh00newc
  • bookyear:1881
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Newcomb__Simon__1835_1909
  • bookauthor:Holden__Edward_Singleton__1846_1914__joint_author
  • booksubject:Astronomy
  • bookpublisher:New_York__H__Holt_and_Company
  • bookcontributor:The_Library_of_Congress
  • booksponsor:The_Library_of_Congress
  • bookleafnumber:457
  • bookcollection:library_of_congress
  • bookcollection:americana
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28 July 2014

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