Pillars of Astronomy

The Legacy of Tycho Brahe 
Brahe was born on 14 December 1546 in Skane, then in Denmark, now in Sweden. He was the eldest son of Otto Brahe and Beatte Bille. Brahe is from a family of high nobility in Denmark. He attended the universities of Copenhagen and Leipzig.  Due to a duel with another student, in Wittenberg in 1566, Tycho lost part of his nose. For the rest of his life he wore a metal insert over the missing part.
In 1572, Tycho Brahe noticed a new star in the constellation of Cassiopeia, which shined more brightly than Venus. He meticulously measured the position of the said star. Astronomers at the modern age eventually realized that the star that Tycho has seen before is actually a supernova. Hence, we now call it as "Tycho's Supernova."
He published all of his recordings in to a book called De Stella Nova (The New Star).
Tycho responded to an offer from King Frederick II to build an observatory in the little island of Hveen, off the coast near Copenhagen. He built his observatory in there, namely Uraniburg. Hveen became an international center for astronomical studies from then onward. 
During the lifetime of Tycho Brahe, he devised new and better instruments. Likewise, he made an accurate observations of the positions of the stars, moon, and the planets. From here, we can conclude that the legacy of Tycho Brahe is mostly observational, though astronomers during that time was actually having a hard time to accurately measure the positions of the planets. 
The model of the universe that he proposed is geocentric, with the sun and the moon revolving around the Earth, and the planets revolving around the Sun. In addition, all motions was along circular paths. 
(This is just a summary I made) :) Thanks for reading.