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Johannes Müller von Königsberg, today best known by the Latin epithet Regiomontanus, was a German mathematician, astronomer, astrologer, translator, instrument maker and Catholic bishop.

He was born in the Franconian village of Unfinden, now part of Königsberg, Bavaria not in the more famous East-Prussian Königsberg.

He was also known as Johannes der Königsberger (Johannes of Königsberg). His writings were published under the name of Ioannes de Monte Regio, a Latinized version of his name. Both names mean "John of King's Mountain". The name "Regiomontanus" was first coined by Philipp Melanchthon in 1534, fifty-eight years after Regiomontanus' death.

A prolific author, Regiomontanus was internationally famous in his lifetime. Despite having completed only a quarter of what he had intended to write, he left a substantial body of work. Nicolaus Copernicus' teacher, Domenico Maria Novara da Ferrara, referred to Regiomontanus as having been his own teacher. There is speculation that Regiomontanus had arrived at a theory of heliocentrism before he died; a manuscript shows particular attention to the heliocentric theory of the Pythagorean Aristarchus, mention was also given to the motion of the earth in a letter to a friend.

The crater Regiomontanus on the Moon is named after him.

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Johannes Müller von Königsberg, today best known by the Latin epithet Regiomontanus, was a German mathematician, astronomer, astrologer, translator, instrument maker and Catholic bishop.

He was born in the Franconian village of Unfinden, now part of Königsberg, Bavaria not in the more famous East-Prussian Königsberg.

He was also known as Johannes der Königsberger (Johannes of Königsberg). His writings were published under the name of Ioannes de Monte Regio, a Latinized version of his name. Both names mean "John of King's Mountain". The name "Regiomontanus" was first coined by Philipp Melanchthon in 1534, fifty-eight years after Regiomontanus' death.

A prolific author, Regiomontanus was internationally famous in his lifetime. Despite having completed only a quarter of what he had intended to write, he left a substantial body of work. Nicolaus Copernicus' teacher, Domenico Maria Novara da Ferrara, referred to Regiomontanus as having been his own teacher. There is speculation that Regiomontanus had arrived at a theory of heliocentrism before he died; a manuscript shows particular attention to the heliocentric theory of the Pythagorean Aristarchus, mention was also given to the motion of the earth in a letter to a friend.

The crater Regiomontanus on the Moon is named after him. More...

 
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