Zachariah Williams' account of his attempt to determine the longitude at sea using lunar observations is a fascinating insight into the early days of navigation by the stars. Williams was one of the first people to attempt this feat after the Longitude Act of 1714 offered a significant reward for anyone who could establish a reliable way to determine longitude at sea. For anyone interested in the history of science or navigation, Williams' account is a must-read. 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.