Synopsis Currently, most people think that science and scientific inventions are the contribution of modern West. In fact, Ancient India has contributed to human civilization many scientific achievements. In the fields of astronomy, mathematics and medicine they perfected and mastered many systems. This book portrays the scientific achievements of ancient India in comprehensive way. We have chosen here ten topics to highlight the theme. Topics like-History of Excellence in Science in India; Hindu Calendar; The Mayan and Hindu Calendars: Comparison and Correlation; The Origin and Development of Numerals; The Present Mode of Expressing Numbers; Cosmographical Theories of the Hindi Astronomers; Aspects of the History of Hindu Astronomy; A Short Chronology of Indian Astronomy; Astronomical Instruments of the Hindus; Greek Influence on Hindu Astronomy: Allegation or Reality?; etc. will put ample light on theme. Scholars and laymen can peep through these to extreme past of India alike.