was a German mathematician and one of the few well-known astronomers of his time. His research contributed substantially to the fact that Kassel
Kassel is a town located on the Fulda River in northern Hesse, Germany. It is the administrative seat of the Kassel Regierungsbezirk and the Kreis of the same name and has approximately 195,000 inhabitants.- History :...
became a European center of the astronomy in the 16th century.
It is not known today when Rothmann was born, although it is known that his place of birth was Bernberg on the Saale, probably between 1550 and 1560. After a basic education he studied theology and mathematics in Wittenberg with support of the prince, Joachim Ernst von Anhalt. Rothmann's enthusiasm for the astronomy was substantial. Christoph Rothmann was appointed in 1577 as court mathematician in Kassel by Prince Wilhelm IV of Hessen. From 1584 to 1590 he was active in astronomy at the observatory of the prince. His research contributed substantially to the fact that Kassel became a center of the astronomical research. In 1590 he visited Tycho Brahe in Uraniborg on the island Ven, but did not return to Kassel. After the trip to Uranienburg he lived until his death in Bernberg and wrote additional (unknown) theological writings.
Christoph Rothmann computed and implemented the Kassel star catalog between 1585 and 1587 almost exclusively under the technical sponsorship of Prince Wilhelm IV. Rothmann was a convinced follower of Nikolaus Copernicus, who justified the heliocentric view
Heliocentrism, or heliocentricism, is the astronomical model in which the Earth and planets revolve around a stationary Sun at the center of the universe. The word comes from the Greek . Historically, heliocentrism was opposed to geocentrism, which placed the Earth at the center...
of the world. In contrast to his prominent astronomical colleagues he fell into oblivion in the 17th century.
In the 16th century in Europe two groups of researchers with the list of new more exact star catalogs had out-done. On side the well-known Dane Tycho Brahe
Tycho Brahe , born Tyge Ottesen Brahe, was a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations...
, who had established the famous observatory Uraniborg
Uranienborg was a Danish astronomical observatory operated by Tycho Brahe; built circa 1576-1580 on Hven, an island in the Øresund between Zealand and Scania, which at that time was part of Denmark. The observatory was shortly after its construction expanded with an underground facility,...
on the island Ven, and a group of astronomers in Kassel at the court of the prince. Here Rothmann and Joost Bürgi
Jost Bürgi, or Joost, or Jobst Bürgi , active primarily at the courts in Kassel and Prague, was a Swiss clockmaker, a maker of astronomical instruments and a mathematician....
, a Swiss mathematician, worked. The two working groups maintained a scientific exchange like an extensive exchange of letters between Kassel and Ven.
An often quoted letter between Rothmann and Brahe pointed out the whole dilemma of the physics at that time. Brahe distrusted the heliocentric view of the world of Nikolaus Copernicus, and raised in a letter to Rothmann the following objection against the movement of the Earth: "if the Earth actually turns from west to east, then a cannon ball, which is shot toward the turning of the Earth, must continue to fly as fast as a projectile fired in opposite direction."
Rothmann answered that both projectile and cannon would participate in the movement of the Earth and so that his objection was invalid. This contradicted however the Aristotelian view of motion then valid in Europe. At that time this was so fundamental a contradiction that it could only be eliminated in the middle the 17th century with the discovery of the force of gravity.
The crater Rothmann
Rothmann is an impact crater that is located in the southeastern part of the Moon's near side, about one crater diameter to the southwest of the Rupes Altai scarp. To the southwest is the slightly larger crater Lindenau....
on the Moon
The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...
is named after him.
- Observatorium stellarum liber primus, Kassel 1589 (manual of the astronomy and Christoph Rothmann's most well-known book) ref
- Astronomia: In qua hypotheses Ptolemaicae ex hypothesibus Copernici corriguntur et supplentur: et imprimis intellectus et usus tabularum Prutenicarum declaratur et demonstratur, Manuscripte von 1580, (in der Universitätsbibliothek Kassel)
- Restitutio Sacramentorum, Goslar 1611, (posthum herausgegebene theologische Schrift)
- Scriptum de cometa, qui anni Christi 1585 mensib. Octobri et Novembri apparuit. Herausgegeben von Willebrord Snellius in: Descriptio cometae, qui anno 1618 mense Novembri primum effulsit (Seite 69-156), Verlag Elzevir, Leiden 1619
- Christoph Rothmann, Miguel A. Granada, Jürgen Hamel, Ludolf von Mackensen: Christoph Rothmanns Handbuch der Astronomie von 1589. Verlag Harri Deutsch 2003, ISBN 978-3-8171-1718-5
- Miguel A. Granada: Christoph Rothmann und die Auflösung der himmlischen Sphären. Die Briefe an den Landgrafen von Hessen-Kassel 1585. In Beiträge zur Astronomiegeschichte Band 2, herausgegeben von Wolfgang R. Dick und Jürgen Hamel, Frankfurt am Main 1999, S. 34-57 http://www.astro.uni-bonn.de/~pbrosche/aa/acta/vol05/granada.html
- Walther Killy: Literaturlexikon. Autoren und Werke deutscher Sprache (15 Bände). Gütersloh, München: Bertelsmann-Lexikon-Verl., 1988-1991 (CD-ROM: Berlin 1998, ISBN 3-932544-13-7)