Concerned about a decline in the success rate of solar eclipse prediction, the KAMO no Yasunori asked Nichien, a priest of the Tendai sect who was studying in Wu-yueh, to bring back the futenreki (the Futian calendar table) and then tried to use it.
保憲は日食予想の成功率の低下などを憂慮して呉越に留学していた日延（天台宗）に依頼して持ち帰らせた符天暦の採用を図った。