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This book is a comprehensive guide to spherical astronomy, covering the basic principles and techniques of observing and calculating the positions and motions of celestial objects. It includes discussions of the Earth's rotation and its effect on the apparent motion of the stars, as well as the use of astronomical instruments like the sextant and the transit circle. With detailed diagrams and mathematical formulas, this book is an essential reference for anyone interested in the practical aspects of 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.