Tycho Brahe's Uraniborg

1590

The Danish astronomer Tycho Brahe had been running his island observatory of Uraniborg for over a decade, compiling the most accurate naked-eye astronomical measurements ever made. Eventually his relationship with the Danish crown soured, and he would transfer his instruments and assistants to the imperial court at Prague. His Mars observations would later enable Kepler to discover elliptical orbits, revolutionizing astronomy.