This book is a rare work of general knowledge that steps across disciplinary boundaries and integrates science and technology with humanistic connotation. It begins with question-and-answer conversations between university teachers and students, and defines “time” as a medium for interdisciplinary discussion on mathematics, astronomy, information technology, music, biology, physics and other disciplines. In addition to the conversations that imply the questions carefully set by the author, there are also elaborate illustrations and academic information that has gone through rigorous research. Reading this book, you will know more about Zu Chongzhi, Zhu Zaiyu, Poincare, Pulais, Zhuang Tzu, Huygens, Borges and other Chinese and foreign scientists and thinkers in history; and learn how the important scientific ideas and inventions came into being, changed and promoted the historical development process. In this book, you will find the explanations to the customs and phenomena that have perplexed you: Are the 24 solar terms the lunar or solar calendar? How did the solar calendar and leap month get fixed? How to measure the time of winter solstice? How to understand continued fraction and golden section?