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In the 12th century China a remarkably improved calendar was developed with the rise of the Shoushi Calendar(授時曆). This new astronomical device, whose main architect had been known as Guo Shou-jing(郭守敬), was only gradually and with much difficulties absorbed by the Koreans throughout the later Koryo and early Choson periods, to be climaxed with the initiation of the first Korean calendar system, the Chiljeongsan(七政算 Calculations of the Seven Luminaries) in 1442(Sejong 24). Because Koreans were not well prepared in the astronomical and mathematical sciences during the pre-Shoushi period, they had to struggle very hard to attain the level of calendrical sciences of the Chiljeongsan.This paper is an effort to explain somewhat detailed desciriptions of the course of the Korean digestion and absorption of the Chinese calendar system with due modifications through the long period of time from the late Koryo to the early Choson. And eventually its delivery to the Japanese after two centuries is briefly explained. For the development of the calendrical sciences in China we have many relevant documents and modern scholarly products. But its introduction into Korea had been very much neglected, although some scholarly attentions were shed upon the Korean calendar system itself. Also the eventual delivery of the Korean version to Japan in the seventeenth century failed to receive due academic attention. This paper shall give more systematic and detailed survey of the Koreans’ learning process of the Chinese astronomy, with digested survey of its introduction into Japan later.