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[DeepL Translation - needs review] Introduction to Volume 1: During the reign of the fourth Tokugawa Shogun, Ietsuna, a project was launched: to create a calendar unique to Japan. The goal of the project was to create a calendar unique to Japan. The calendar in use at the time, the Xuanming calendar, had lost its accuracy and was beginning to deviate. Harumi Shibukawa was chosen to carry out the calendar revision. Harumi was born into a prestigious family of go players, but he was tired of h...