Ferdinand Hassler's comprehensive overview of the universe is a tour-de-force of scientific knowledge. From the motion of the planets to the structure of the stars, Hassler explains the workings of the cosmos in accessible language. The book is also illustrated with numerous plates and tables for easy reference. A classic work of popular science. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.