The sine quadrant is an ancient instrument used to graphically solve mostly astronomical formulas, including spherical trigonometry, using a string. This book is an excerpt from the comprehensive GQT5, it consists of the description of the sine quadrant, its tools, principles, functions, and method, together with a primer on the required astronomy knowledge. It describes instructions for all basic functions as well as advanced methods and graphically worked formulas. The chapters on the functions of the sine quadrant have been completely revised and expanded based on the results of new research, with full explanations demonstrating its completeness as a "supercomputer" for solving any trigonometric problem. The book comprises 175 pages, 58 figures, 10 tables, 39 equations, an indexed glossary and a complete bibliography.
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