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Case file s1051 · Science and medicine · 1601
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1601
Tabulae Rudolphinae - Frontispiece: Frontispiece of : "Tabulae Rudolphinae : quibus astronomicae ...." by Johannes Kepler
Tabulae Rudolphinae - Frontispiece. gestochen von Georg Köler nach einem Entwurf von Johannes Kepler. Public domain, Wikimedia Commons.
Died
24 October 1601
Place
Prague, Czech Republic
Field
astronomy · Science, medicine and academia on the timeline
Legal tradition
imperial patronage and printing privilege in the Holy Roman Empire; heirs' property in a dead man's papers · Roman law
Historical event
Emperor Rudolf II's court in Prague
Religion
Tycho Brahe: Protestant and Anglican (recorded as Lutheranism on Wikidata; Danish Lutherans on Wikipedia)
Science and medicineEmpires and conquestEuropeCzech Republic

Tycho Brahe's heirs were never paid for his observations, so they took them back from Kepler and won the right to censor his books

Tycho Brahe recorded the positions of the planets for decades. He moved to Prague under Emperor Rudolf II and hired Johannes Kepler as a mathematical assistant. Tycho died in Prague on 24 October 1601, eleven days after a sudden illness. Kepler succeeded him as imperial mathematician and took over Tycho's posthumous publications, including the planned Rudolphine Tables. The emperor never paid Tycho's heirs for his astronomical assets. Led by Tycho's son-in-law and former assistant, Franz Gansneb Tengnagel, the heirs questioned Kepler's fitness to carry on the work and took the mandate back. They also won the legal right to censor his publications. Historian James Voelkel argues that this dispute shaped Kepler's Astronomia nova of 1609, which set out his first two laws of planetary motion, as an interim report to justify his use of the data. The Rudolphine Tables were printed in Ulm in 1627. In their dedication to the emperor, the heirs say the tables were built from their father's observations, which Kepler received "in good faith", and call the work their only remaining inheritance. In 2010 a Danish and Czech team exhumed Tycho in Prague to test the theory that he was poisoned. In 2012 they ruled out mercury poisoning. The cause of his death is still not known.

What the law took from it

A dead scholar's data is property, and an unpaid sale leaves the heirs holding it.

Sources
  1. cambridge.orgScholarship
  2. mathshistory.st-andrews.ac.ukScholarship
  3. sourcelibrary.orgPress
  4. projekter.au.dkPress

Cite as: celebrity.estate, “Tycho Brahe's heirs were never paid for his observations, so they took them back from Kepler and won the right to censor his books,” story s1051, https://www.celebrity.estate/tycho-brahe-1601, updated 30 October 2026.

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Where this case sits

Science and medicineEmpires and conquestEuropeRoman lawCzech Republic