List of Dates.

Johann Kepler, born 1571;

school at Maulbronn, 1586;

University of Tübingen, 1589;

M.A. of Tübingen, 1591;

Professor at Gratz, 1594;

“Prodromus,” with “Mysterium Cosmographicum,” published 1596;

first marriage, 1597;

joins Tycho Brahe at Prague, 1600;

death of Tycho, 1601;

Kepler’s optics, 1603;

Nova, 1604;

on Comets, 1607;

Commentary on Mars, including First and Second Laws, 1609;

Professor at Linz, 1612;

second marriage, 1613;

Third Law discovered, 1618;

Epitome of Copernican Astronomy, 1618-1621;

Rudolphine Tables published, 1627;

died, 1630.