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Astronomy Without a Telescope; A Guide to the Constellations, and Introduction to the Study of the Heavens with the Unassisted Sight

Astronomy Without a Telescope; A Guide to the Constellations, and Introduction to the Study of the Heavens with the Unassisted Sight


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 edition. Excerpt: ...rare one it must be admitted, but a chance not to be despised--of making a discovery of a most interesting kind. Occasionally comets passing through our system so approach us as not to be seen until they are close to the sun, and these are usually comets of exceptional interest, both from the character of their orbits and from their physical behaviour. Such objects the persistent observer of heliacal risings and settings is--from the nature of his work, and from the special acuteness in detecting objects in the twilight sky which it will have given to him--the most likely to be the first to discover. The great comet of the autumn of 1882, for instance, was first seen at sundown, the great southern comet of 1901 was detected just before sunrise; in both cases only a very short time before the comet passed into conjunction with the sun, and was temporarily lost to view. In both cases a regular " heliacal" observer would have stood a good chance of being two or three days ahead of anyone else in the discovery, to the gain of his own reputation and of astronomical science. The three stars mentioned earlier, Sirius, Procyon and Eigel, may be observed to rise during the latter half of August; their settings fall in April and May. They are thus emphatically winter stars, Eigel coming to opposition on December llth, Sirius on December 31st, and Procyon on January 12th. In the case of these stars, the opposition falls nearly midway between the date of rising and that of setting. Not so with stars near the equinoctial colures. Thus Spica rises at the end of October, comes to opposition on April 12th, and sets in the middle of August. Hamal, on the other hand, rises near the end of May, comes to opposition on October 26th, and sets in the middle of April....


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Product Details
  • ISBN-13: 9781150429989
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1150429984
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr


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Astronomy Without a Telescope; A Guide to the Constellations, and Introduction to the Study of the Heavens with the Unassisted Sight
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