Book excerpt: Chinese Astrology and Astronomy: An Outside History discusses the ancient Chinese's needs and reasons for engaging in astronomy. It presents the study on ancient astronomical phenomena and manuals, and analyzes the cosmological views of ancient Chinese. It also expounds the nature and functions of astronomy to ancient Chinese, as well as its difference from the western modern astronomy of today, exploring on new issues in a bold but logical fashion, and offering arguments that challenge even the views of authority.This book stands as a translated version, by Chen Wenan, an associate professor of Ningbo University, of the original Chinese publication Tianxue Waishi by Jiang Xiaoyuan.