Library of Universal History and Popular Science

Library of Universal History and Popular Science : Containing a Record of the Human Race from the Earliest Historical Period to the Present Time. Embracing a General Survey of the Progress of Mankind in National and Social Life, Civil Government, Religion,

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Excerpt from Library of Universal History and Popular Science: Containing a Record of the Human Race From the Earliest Historical Period to the Present Time. Embracing a General Survey of the Progress of Mankind in National and Social Life, Civil Government, Religion, Literature, Science and Art The answer is, in the immense majority of cases, no difference at all; their distance is so vastly greater than miles that a change of base to this extent makes no change perceptible to the most refined instruments in their bearings as seen from the earth. But the perfection of modern instruments is such, that a change of even one second, or 8300th part of one degree, in the annual parallax, as it is called, of any fixed star, would certainly be detected. This corresponds to a distance of times the length of the base of miles, or of miles, a dis tance which it would take light moving at the rate of miles per second, three years and eighty-three day to traverse. There is only one star in the whole heavens, a bright star called Alpha, in the constellation of the Centaur, which is known to be as near as this. Its annual parallax is or very nearly and therefore its distance very nearly 20 millions of millions of miles. All the other stars, of which many millions are visible through powerful telescopes, are further 011' than this. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.show more

Product details

  • Paperback | 458 pages
  • 152 x 229 x 24mm | 608g
  • Forgotten Books
  • United States
  • English
  • , black & white illustrations
  • 0243085745
  • 9780243085743