Oct. 24, 1601: The death of Tycho Brahe

Today in the history of astronomy, one of history's greatest astronomers passes away. | Published: October 24, 2026 In addition to his own astronomical work, Tycho Brahe laid the groundwork for revolutionary science by Johannes Kepler and Isaac Newton decades after his death. Credit: R Cooper, Public domain, via Wikimedia Commons In Astronomy’s 2022 list of the 20 greatest astronomers of all time, Associate Editor Michael Bakich ranked Tycho Brahe No. 2, second only to Galileo, noting: “Danish astronomer Tyge (Tycho) Ottesen Brahe was history’s greatest pre-telescopic observer.” Born Dec. 14, 1546, Tycho was raised by an uncle who funded his education at the University of Leipzig. There, he discovered that most existing publications of stellar and planetary positions were hugely inaccurate, and decided to devote his life to rectifying this problem. Among the career highlights that prompted Bakich to rank him so high: “Although Brahe didn’t have a telescope, he constructed many observing instruments: several quadrants, an armillary sphere, a sextant, and a large globe. Two of his famous observations were of the supernova that appeared in 1572 (now called Tycho’s Nova) and the Great Comet of 1577. When he measured their positions, he saw no parallax, meaning that their distances placed them beyond the Moon.” Tycho died Oct. 24, 1601, in Prague, leaving his data to his protégé, Johannes Kepler. His careful observations allowed Kepler to determine the laws of planetary motion; these laws, in turn, became the basis for the work of Isaac Newton. Elisa Neckar is senior production editor of Astronomy magazine, and the editor of the Today in the History of Astronomy feature on Astronomy.com.