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

Highest position attained in his career was Jiaoyu 教諭 (Instructor, or Head Teacher) of Zhending fu 真定府 (Hebei).

Birth in Zhili 直隸.

Meeting with Yu Zhengji took place after the eclipse of 1479=12=29; must also be after compilation of Gai li yi 改曆議

Yu Zhengji 俞正己 was thrown in prison on account of his compilation of Gai li yi 改曆議 . DMB suggests that Zhou Hongmo 周洪謨 was instrumental in this action. It also suggests that his was a minor offense, just because he "recommended calendar reforms".