astronomers timeline By elyssasculthorpe 230 BCE Aristarchus' Death 194 BCE Eratosthenes' Death 170 BCE Ptolemy's Death 1543 Copernicus' Death 1630 Kepler's Death 1642 Galileo's Death 1726 Newton's Death Period: 1730 to 1950 Major societal & political changes / War Industrial Rev, American Rev, French Rev, WWI & WWII 1953 Hubble's Death 1955 Einstein's Death 1997 Tombaugh's Death 2018 Hawkings' Death