Published online by Cambridge University Press: 12 April 2016
It is proved that the Futian calendar, a non-official one compiled in the Jianzhong reign period (780-783) in China, was brought to Japan in 957 by a Buddhist monk and was employed as the basis of horoscopes by the Buddhist school of astrology (Memo 1964). It was also used in competition with the official Chinese xuanming calendar for the usual functions demanded of a Chinese type lunisolar ephemerides, such as eclipse predictions. According to the view of the Song Dynasty Chinese scholar Wang Yinglin that the Futian calendar was “originally an Indian method of astronomical calculation” but Kiyosi Yabuuti has commented that Wang Yinglin’s appraisal of the Futian calendar is solely based on a resemblance in form as it copied the trivial point of taking its epoch as the Jiuzhi calendar according to Indian astronomical methods and does not display a fundamental understanding of the Indian calendar (Yabuuti 1944).