This comprehensive guide to astronomy covers both the theoretical and practical aspects of the field. Topics include the problems of spherical astronomy, the use of fixed and portable astronomical instruments, and the special applications of astronomy to navigation. With clear explanations and detailed diagrams, this book is an essential reference for anyone interested in astronomy. 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.