Lǐ Tiānjīng 李天經
Style name Réncháng 仁常, zì also Xìngcān 性參. Native of Wúqiáo 吳橋 in Héjiān 河間 prefecture (Zhílì, modern Héběi). Born Wànlì 7 (1579); died Shùnzhì 16 (1659).
Jìnshì of Wànlì 41 (1613). Successive Míng offices: District Magistrate; Bīngbù lángzhōng 兵部郎中 (Director, Ministry of War); Guānglùsì qīng 光禄寺卿 (Court of Imperial Entertainments). Catholic convert (baptismal name not securely recorded; sometimes given as Petrus / Bǐdé 彼得).
Following the death of Xú Guāngqǐ 徐光啟 (徐光啟) in November 1633, Lǐ Tiānjīng was named by the Chóngzhēn court to succeed him as Director (tídū 提督) of the Calendar-Reform Bureau (Lìjú 曆局), inheriting both Xú’s official position and the editorial responsibility for the unfinished portions of the Chóngzhēn lìshū 崇禎曆書 (KR3f0013 Xīnfǎ suànshū). He served in this role from 1633 to the fall of the Míng in 1644, completing the remaining volumes of the project, supervising further Jesuit-collaborative work on instruments, and presenting the completed materials to the throne in installments through Chóngzhēn 7 (1634) and 8 (1635).
After the Manchu conquest he survived as a yímín 遺民 (former-dynasty subject), retiring to private life. He died in 1659 — the same year as Manuel Dias the Younger (陽瑪諾), his collaborator from the Beijing Jesuit residence.
Lǐ Tiānjīng’s signature contribution to Chinese science was less original-discovery than institutional continuity: by maintaining the Lìjú through the destabilizing political events of the late Chóngzhēn, he ensured that the Chóngzhēn lìshū materials survived complete and in revisable form into the early Qīng. The 1645 promulgation of the reformed calendar as the Shíxiàn lì 時憲曆 by Adam Schall von Bell (湯若望) under the new Shùnzhì regime depended directly on the materials Lǐ Tiānjīng had preserved.