Tycho Brahe was a Danish astronomer born in 1546, known for his accurate and comprehensive astronomical observations. He built two observatories, Uraniborg and Stjerneborg, on the island of Hven, where he meticulously recorded the positions of stars and planets without the aid of a telescope, which had not yet been invented. Brahe's work laid the foundation for modern astronomy, influencing later scientists like Johannes Kepler. He proposed a geoheliocentric model, where the Earth was at the center of the universe, but the planets revolved around the Sun. His detailed observations were crucial for the advancement of celestial mechanics.