The position that manages Onmyoryo to supervise all work related to astronomy, the calendar, wind/clouds and atmospheric conditions, when abnormal conditions occur, to seal the record to make sure information is not leaked outside and private reports to the Emperor (tenmon misso (reporting unusual astronomical phenomena to the emperor)), to submit the new year's calendar developed by reki hakase by November 1 of the year (goryakuso (submission of the next year's calendar)), and reporting the outcome of senzei and chiso to the Emperor each time they are performed.
陰陽寮を統括し、天文・暦・風雲・気色をのすべてを監督して、異常発生時には外部に漏れることなくこれを記録密封し極秘に上奏（天文密奏）、暦博士が作成した新年の暦を毎年11月1日までに調進（御暦奏）、また都度占筮及び地相の結果を上奏する職務。