Double Star Catalogues 1 14

Author : Sherburne Wesley Burnham
Publisher : Forgotten Books
ISBN 13 : 9780260347053
Total Pages : 318 pages
Book Rating : 4.3/5 (47 download)

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Download or read book A General Catalogue of Double Stars Within 121° of the North Pole, Vol. 1 written by Sherburne Wesley Burnham and published by Forgotten Books. This book was released on 2017-12-11 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A General Catalogue of Double Stars Within 121 of the North Pole, Vol. 1: The Catalogue There is another class of double stars, principally from the observations of comparatively modern observers, where no attempt seems to have been made, beyond perhaps reading the coarse circles of the equatorial, to identify the star or give the exact place. As many as possible of these stars have been identified; others are not in or very near the given places; and still others obviously have large and uncertain errors of place which will make their identification hereafter a matter of accident or good luck. There seemed to be no object to be gained by giving the right ascensions any closer than the nearest whole second of time, since as a matter of fact a large number of these stars have a much greater uncertainty in place from the lack of meridian positions, and from the lack of knowledge of their proper motions; and to give the right ascensions to small fractions of a second would imply an accuracy which would be unwarranted by the material at hand. This is also true generally of the dccli nations. While perhaps for a greater part of the stars, the nearest tenth of a minute of arc might have been given, it would have had no significance in the case of several thousand stars; and in any event would not have made the catalogue any more useful for any conceivable purpose, practical or otherwise. In any investigation concerning the proper motion, or the exact place of the star, the original catalogues of position will of course be consulted. All of the stars are north of the equator, unless otherwise indicated by the minus sign attached to the degrees of declination. The advantage of the omission of the plus sign for the northern stars in rapidly finding any star, either north or south, will be apparent to those who have had to do this frequently in catalogues where all the signs are given. 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.