India was a major power during ancient and medieval times. But very little is known about its scientific and technological achievements, and the contributions that were very influentia1 to human civilization. India had the highest standards of living; it introduced math (including the number zero) to the world, along with many other inventions that date back more than 4,000 years. India's many contributions (including brick technology, Ayurvedic medicine, yoga, and the first medical school) were the inspiration for this well-balanced encyclopedia, which seeks to reintroduce classical Indian sciences to scholars and others. This volume offers alphabetically arranged entries, covering agriculture, algebra, arithmetic, astrology, astronomy, calculus, decimal rotation, geography, geometry, mathematics, medicine, military technology, physics, textiles, weights and measures, yoga, zero, and more. They represent the work of scholars from many countries. Additionally, biographies of many well-known ancient Indian scientists are included