Nihonshoki (beginning) Title Nihonshoki. Vol.19 Physical data 1v. Creator -- Note An old edition of type printing. Date 1610 Subject(NDC) 210.3 Publisher -- Call No. WA7-120 Place --     An entry dated June of the 14th year of Emperor Kinmei (553) in the Nihonshoki, Japan's oldest chronicle, states that the government planned to invite a calendar expert from Paekche to introduce a calendar to Japan, making it the first reference to a calendar in all Japanese records. Back then, all matters relating to the calendar were determined by the Imperial Court. Under the Ritsuryosei system of centralized administration under the Ritsuryo legal code of the Taika Reformation, the Onmyoryo of Nakatsukasasho was in charge of the task. An Onmyoryo was a government office that had jurisdiction over calendar preparation, astronomy, divination, etc. It was a time when calendars and divination were inseparable. From the end of 10th century, the task of preparing the calendar was handed down in the Kamo family, while astronomy passed through generations of the Abe family, its patriarch being Abe Seimei (921-1005), noted as an Onmyo-shi, or specialist in the realm of calendars and divination.