Ptolemy's system of astronomy held up until 1543, when this Polish astronomer went heliocentric
[DOC] [TLE] Nicolaus Copernicus (Stanford Encyclopedia of Philosophy) [PAR] Nov 30, 2004 ... At the time Copernicus's heliocentric idea was very controversial; .... of the book, 
and on 24 May 1543 Copernicus held a copy of the finished work on his 
deathbed.