People and Events
•Nicolaus Copernicus 1473 – 1543 De Revolutionibus
 •Tycho Brahe 1546 - 1601 1572 Tycho’s supernova
 1576-1597  Planet Positions
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•Johannes Kepler 1571 – 1630 1609  Laws 1 & 2 publish
 1611  Law 3 published
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•Galileo Galilei 1564 – 1642 1609  Telescope
 1632  Dialog published
•Isaac Newton 1642 – 1727 1687  Principia published