This reference work provides navigators with the tools they need to determine the azimuth of celestial bodies at sea. The tables and diagrams included in this volume enable navigators to calculate the position of stars and planets in the sky, and use this information to determine their own position on the earth's surface. This is an essential resource for anyone involved in navigation or 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.