In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: This man's namesake star is a supernova in Ophiuchus described in his book "De stella nova", while in "Dioptrice" he postulated a ray theory of light to explain vision. While professor of mathematics at Graz, he wrote "Mysterium cosmographicum", which brought him to the attention of his future mentor, whose astronomical calculations he completed as the "Rudolphine Tables". These calculations led to his most famous contributions to astronomy, found in "Astronomia nova" and "Harmonices mundi". FTP, who was this assistant to Tycho Brahe best known for his three laws of planetary motion.
A:
Science