Rokoku Hakase was a post appointed by Onmyoryo (a government office that had jurisdiction over calendar preparation, astronomy, divination, etc.) under the Ritsuryo system (a system of centralized government based on the ritsuryo code) in Japan.
漏刻博士（ろうこくはかせ）は、日本律令制において陰陽寮に置かれた博士。