Furthermore, starting in 757, rekisansho, a combination of calendar study and Sando, was set up as another division so that Reki no sho (students of calendar) who were learning rekido (calendar study) at the Onmyo-ryo (Bureau of Divination) could learn the mathematics required for rekido.
また、天平宝字元年（757年）からは陰陽寮で暦道を学ぶ暦生の中から暦学に必要な数学を学ぶために算道を兼修する暦算生が別枠として設置された。