, commonly called Regiomontanus, from his native place, Mons Regius, or
, commonly called Regiomontanus, from his native place, Mons Regius, or Koningsberg, a town in Franconia, was born in 1436, and became the greatest astronomer and mathematician of his time. He was indeed a very prodigy for genius and learning. Having first acquired grammatical learning in his own country, he was admitted, while yet a boy, into the academy at Leipsic, where he formed a strong attachment to the mathematical sciences, arithmetic, geometry, astronomy, &c. But not finding proper assistance in these studies at this place, he removed, at only fifteen years of age, to Vienna, to study under the famous Purbacb, the professor there, who read lectures in those sciences with the highest reputation. A strong and affectionate friendship soon took place between these two, and our author made such rapid improvement in the sciences, that he was able to be assisting to his master, and to become his companion in all his labours. In this manner they spent about ten years together, elucidating obscurities, observing the motions of the heavenly bodies, and comparing and correcting the tables of them, particularly those of Mars, which they found to disagree with the motions, sometimes as much as two degrees.