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Johannes Praetorius
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Johannes Praetorius : ウィキペディア英語版
Johannes Praetorius

Johann Richter or Johannes Praetorius (1537 – 27 October 1616) was a Bohemian German mathematician and astronomer.
== Life ==

Praetorius was born in Jáchymov, Bohemia. From 1557 he studied at the University of Wittenberg, and from 1562 to 1569 he lived in Nuremberg. His astronomical and mathematical instruments are kept at Germanisches Nationalmuseum in Nuremberg.
In 1571 be became Professor of mathematics (astronomy) at Wittenberg where he met Valentinus Otho and Joachim Rheticus. He died in Altdorf bei Nürnberg, aged about 79.
He taught Copernicus' theory of astronomy initially as a means of eliminating the equant from Ptolemy's account, and later moving to a proto-Tychonic system.

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