When Johannes met Tycho

Tycho Brahe was one of the great figures of 16th century astronomy, at a time when the science was shaking loose from the shackles of old ideas handed down from Aristotle and Ptolemy. He made significant discoveries, sighting the supernova of 1572 (later called ‘Tycho’s Star’), and demonstrating that a comet he tracked lay beyond the Moon, and was not just some disturbance within our atmosphere, as older