Tycho Brahe
Tycho Brahe was a famous Danish astronomer. He was born in 1546 and died in 1601. His family was quite rich so they sent him away to study, first at Copenhagen, then at Leipzig. Tycho's main subject at Leipzig was actually Law, but he also studied astronomy on the side. When he was twenty years old he moved to Wittenburg University in Germany to study maths and astronomy. However, in 1566 he had to flee from Wittenburg because of the Plague. He moved to University of Rostock, but did not stay there long because he got in a fight with a fellow student. He was fined for duelling and also lost part of his nose which he famously had replaced with a silver nose which he would sometimes keep in a box in his pocket.

In 1576 the king of Denmark, Frederick II, gave Tycho an island near Copenhagen so that he could set up an observatory there. The island was called Hven and Tycho built a huge observatory in two castles there. He called one Uraniborg, which means 'Heavenly Castle', and the other Stjerneborg which means 'Starry Castle'. Tycho equipped his observatory with many huge instruments for observing the stars - by far the biggest that had ever been made up to that date. Tycho fell out with King Frederick II in 1597. Two years later he moved to Prague, where he became the Imperial Mathematician to the Holy Roman Emperor, Rudolph II. Johannes Kepler, another famous astronomer, was his assistant and helped him with mathematical calculations. Tycho died in 1601.