Here, from 1600 until his death in 1601, he was assisted by Johannes Kepler who later used Tycho's astronomical data to develop Kepler's laws of planetary motion.
He was assisted by Johannes Kepler. This was until his death in 1601. This was from 1600. This was here. This Johannes Kepler later used Tycho's astronomical data. This was to develop Kepler's laws of planetary motion.