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August Kohler, 1910, held at the Kepler-Museum in Weil der Stadt · Kepler-Museum, Weil der Stadt (Kepler's birthplace), via Wikimedia Commons · Public domain
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Sources
- Johannes Kepler
- Johannes Kepler (Q8963)
- MacTutor History of Mathematics Archive (University of St Andrews), "Johannes Kepler" -- scholarly biographical account covering his appointment under Tycho Brahe (1600), the multi-year Mars-orbit project he called his 'war with Mars' (surviving as 'nearly a thousand surviving folio sheets of arithmetic'), the abandonment of circular orbits for the ellipse (essentially completed 1605, published in Astronomia Nova, 1609), and the Rudolphine Tables as Imperial Mathematician. Fetched and read directly.
- Job Kozhamthadam, review of Kitty Ferguson's "Tycho and Kepler" (Walker Publishing, 2002), "Kepler and Tycho Brahe: the odd couple," Physics World (Dec 2002) -- a press review of a double biography, quoting specific documented incidents: the pair's initial personality clash ('pouted at each other, argued constantly, quarrelled frequently and finally ... Kepler walked out'), Tycho's data-access possessiveness ('self-centred and overprotective of his observational data, persistently refusing to share'), their reconciliation, and Kepler's improved data access after Tycho's 1601 death. Fetched and read directly. This is a review of Ferguson's biography, not the biography itself directly read -- confidence held accordingly on any row resting on it.
- Linda Hall Library, "Scientist of the Day: Johannes Kepler" -- independent institutional (science history library) account confirming the 1600 start of the Mars project, the intermediate 'vicarious hypothesis' model, and Kepler's own account of testing an elliptical orbit 'just as an approximation' and being 'stunned when the errors were reduced to zero.' Fetched and read directly.
- Thony Christie, "Getting Kepler Wrong," The Renaissance Mathematicus (3 Aug 2016) -- a working historian of science's corrective blog post on popular Kepler myths, confirming the 8-arcminute-error episode (attached to Kepler's oval/near-elliptical trial orbits, not the final ellipse itself) while cautioning that the popular 'clean sequential replacement of circles with ellipses' narrative oversimplifies Kepler's own simultaneous non-empirical (Platonic-solid, harmonic) commitments. Used here specifically to calibrate against overstatement, not as primary support. Fetched and read directly.
- Walter William Bryant, "Kepler" (1920), Chapter VI: Closing Years -- a published biography (public domain, hosted on Wikisource), giving specific dated detail on Kepler's completion of the Rudolphine Tables as Imperial Mathematician: pursuing 6000 florins owed by the Imperial Treasury across multiple towns over roughly a year, the Jesuits sealing his library, a peasant revolt blockading Linz that nearly destroyed the manuscript, his relocation to Ulm, disputes with printer Jonas Saur, and publication completed by September 1627 in time for the Frankfurt Book Fair. Fetched and read directly.