Explore the fascinating history of longitude, from the earliest attempts to measure it to the groundbreaking discoveries of the 18th century. Written by the renowned Andrew Mackay, this comprehensive guidebook offers a detailed overview of the theory and practice of finding the longitude, both at sea and on land. 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.