Excerpt from The System of the Stars Fifteen years have elapsed since the original publication of the present work; and fifteen years count as a long spell of time where sidereal research is in question. In preparing the Second Edition, accordingly, I have introduced extensive modifications. Considerable sections of the book have been recast, and all have been thoroughly revised. New chapters have been inserted, old ones have been in large part suppressed. Drastic measures of reform have, in short, been adopted, with results that certainly import progress and (it is hoped) constitute improvements. Most of the Illustrations are entirely new; and I am under great obligations for the use of valuable photographs and drawings, among others, to Sir David Gill, F.R.S., to Professor Hale and the University Press of Chicago, to the Rev. W. Sidgreaves, S.J., to Professors E. C. Pickering, Campbell, Barnard, and Frost, and to Dr. Max Wolf of Heidelberg. 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 techlogy 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.