Benjamin Franklin
83% Profile Match
Engraver unknown, in Athanasius Kircher, China monumentis, Amsterdam, 1667. Digitised by the Wellcome Collection (https://wellcomecollection.org/works/y35ztr9n; Internet Archive item b33551364) · Engraved plate in Athanasius Kircher, China monumentis (Amsterdam: Jansson van Waesberge and Weyerstraet, 1667), showing Matteo Ricci and, to the right, Xu Guangqi named in Chinese characters in the cartouche above him. Taken from the Wellcome Collection's digitised copy (Internet Archive item b33551364, leaf 169). The right-hand figure with the name cartouche was cropped from the library's 3788 x 5708 pixel scan and downscaled to 638 x 1200, with no upscaling and no retouching. A posthumous European print, not a portrait from life; the engraver is not named. · Public domain (Wellcome Collection item-level Public Domain Mark; a book published in 1667)
Trait Constellation
Key Achievements
Ming scholar who, working with the Jesuit Matteo Ricci, translated the first six books of Euclid's Elements into Chinese in 1607 and invented Chinese terms for geometric concepts that entered Chinese mathematics; Britannica and MacTutor call him the first of his countrymen to translate European books into Chinese.
Entrusted in 1629 with reforming the Chinese calendar after the Western-method eclipse forecast outdid its rivals on some measures, he directed Jesuit astronomers in the work, which was left unfinished at his death in 1633; modern astronomers find the Western forecast better on magnitude and duration but not on every timing.
Compiled the 60-juan agricultural encyclopedia Nongzheng quanshu, covering field systems, water conservancy, tools, crops, silk and disaster relief; it was unfinished at his death, the emperor asked for his manuscripts, and Chen Zilong's revised edition was printed in 1639.
Moments That Reveal Them
In the translation of Euclid, Ricci explained the Latin text orally and Xu wrote down what he understood; for concepts with no Chinese words, such as point, curve, parallel line and acute angle, he invented the terms.
This is consistent with close, sustained collaboration across a language gap and a willingness to build the vocabulary a new field needed. Collaboration
When the emperor wished to punish the astronomers for a failed eclipse forecast, Xu answered that Guo Shoujing's method had also failed once, that calendars drift over time and should be corrected in good time; the emperor then ordered the Jesuits to compute the calendar with Xu as supervisor.
This is consistent with arguing for a technical remedy rather than blame, and with persuading a sceptical authority to adopt it. Persuasiveness
Turning Points
In 1629, after the Western-method forecast of the 21 June eclipse compared well against the Chinese and Muslim forecasts in a government contest, he was appointed to lead the calendar reform and from then directed work with Johann Terrenz, Giacomo Rho and Adam Schall.
This is consistent with years of study of European astronomy turning into a leading role in a major scientific project. Mastery Orientation
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Sources
- Xu Guangqi (Q420427), verified live via the Wikidata API (2026-11-04): English label 'Xu Guangqi', description 'late-Ming-dynasty Chinese politician, scholar, lay Catholic leader and Servant of God', Korean label 서광계, born 1562 (two dates recorded, 24 April and 4 May), died 8 November 1633. Orientation only; not used as support for any row.
- Wikipedia, 'Xu Guangqi' (English article, read as orientation only). Not counted as a substantive source and not used as support for any row or card.
- Encyclopaedia Britannica, 'Xu Guangqi' (short entry by the Britannica editors, about 200 words), read in full. CANONICAL SIGNIFICANCE SOURCE: Ming-dynasty official and the most influential Chinese convert to Christianity before the 20th century; he obtained the jinshi degree in 1604 and studied with Matteo Ricci; he was the first of his countrymen to translate European books into Chinese, translating with Ricci Western books on mathematics, hydraulics and geography, the most famous being Euclid's Elements (Jihe yuanben), which exerted a great influence on Chinese mathematics; in 1629 the Western method, which he represented, proved most accurate in a government competition to predict a solar eclipse. The entry is brief and its facts overlap with the MacTutor biography, so it is not an independent check.
- J. J. O'Connor and E. F. Robertson, 'Xu Guangqi', MacTutor History of Mathematics Archive, University of St Andrews (2003), read in full: a history-of-mathematics biography of his translations with Ricci (the first six books of Euclid's Elements in 1607, the oral-then-written method, the new Chinese geometric terms), the calendar reform after the 1629 eclipse contest, and a critical passage that he talked down the Chinese mathematical tradition and that most Chinese mathematicians stayed with their traditional approach. It also discusses his advice on Western artillery, which is not used here.
- History of the Ming (Ming shi, compiled 1739), juan 251, biography of Xu Guangqi, read in the Chinese Wikisource transcription (flagged there as only partly proofread): a near-contemporary official account saying that he learned astronomy, calendrical mathematics and firearms from Ricci and then read widely on military affairs, agricultural colonies, salt policy and irrigation; that he argued the emperor should revise the calendar rather than punish the astronomers; that he submitted a series of astronomical treatises and tables in the early 1630s; that on his death the officials said he left no surplus wealth; and that the emperor asked for his surviving manuscripts, which his son presented as the 60-juan Nongzheng quanshu. An official dynastic history, so its judgements are retrospective.
- Biographical Dictionary of Chinese Christianity (BDCC), 'Xu Guangqi', reproduced with permission from the Dictionary of Asian Christianity (Eerdmans, 2001), read in full: a Catholic reference entry recording his meetings with Ricci, his joint translations (mathematics, hydraulics, geography, astronomy), his study with Sabatino de Ursis, and the 1629 commission to revise the calendar with the help of Johann Terrenz, Giacomo Rho and Adam Schall; it also records his defence of the Jesuits in 1616 and his baptism, which are religious and are not scored here. The entry is written from the Church's viewpoint.
- Sperello di Serego Alighieri and Elisabetta Corsi, 'The Eclipse of 21 June 1629 in Beijing in the Context of the Reform of the Chinese Calendar', Journal of Astronomical History and Heritage 23(2), 327-334 (2020; arXiv 2006.16766), read in full: two astronomers compare the Chinese, Muslim and Jesuit forecasts as reported by Xu Guangqi with a NASA reconstruction, find that none was accurate, that the Western method did best on magnitude and duration (a 3-2 result against the traditional method) and that Xu probably used this and the correct 1610 forecast to persuade the emperor; they also cite a 2007 study by Lu that finds the Western method worse. An independent modern check on the central calendar episode.
- Chinese Moment, 'Nongzheng quanshu 農政全書 Whole Book on Agricultural Activities' (online Chinese-culture reference page; the author is not named on the page), read in full: describes the 60-juan encyclopedia compiled by Xu Guangqi, its twelve sections (agricultural roots, field systems, agricultural matters, water conservancy, tools, planting, silk, trees, livestock, fabrication, and disaster relief with medicinal herbs in juan 43-60), his other agricultural treatises (cotton, sweet potato, bamboo and others), and that it was not completed in his lifetime and was revised by Chen Zilong and first printed in 1639. A secondary web page of undetermined authorship, used only for the structure and publication history.
- Wellcome Collection copy of Athanasius Kircher, China monumentis (Amsterdam: Jansson van Waesberge and Weyerstraet, 1667), Internet Archive item b33551364, item-level Creative Commons Public Domain Mark; the engraved plate near the start of Part II shows Matteo Ricci and, in Chinese characters above him, Xu Guangqi. Opened for the portrait only; the book text was not read.