This book is a classic treatise on plane and spherical trigonometry, with a focus on practical applications in surveying, navigation, and astronomy. It includes detailed explanations of the key concepts and definitions in trigonometry, as well as a range of exercises and problems to help readers develop their skills. With its comprehensive coverage and clear, accessible style, this book has remained a valuable resource for students and professionals alike.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.

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