Individual itineraries and the circulation of scientific and technical knowledge in East Asia (16th–20th centuries)

Memorial to the emperor in the Zhengde period saying that there is something wrong with the new calendrical system and it needs further study. Should go back to the old system for the time being. He says "at present" Zhengde yihai (1515=01=15 ～ 1516=02=02

Position of Zhongguan zheng 中官正 (Director of the Mid-year Office, one of 5 seasonal Offices of calendrical specialists in the Directorate of Astronomy, Qintianjian 欽天監).