Tycho was the last of the naked-eye observers, and a very careful one who kept detailed records. Perhaps Tycho's greatest contribution to astronomy, though, was hiring an assistant named Johannes Kepler (1571-1630):
Perhaps Tycho's greatest contribution to astronomy, though, was hiring an assistant named Johannes Kepler (1571-1630):
http://www.kepler.arc.nasa.gov/johannes.html
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