1571 – Born on December 27th in Weil der Stadt, Baden-Württemberg, Germany. A German astronomer and mathematician who discovered Kepler’s Three Laws of Planetary Motion (first law stating that planetary orbits are ellipses with sun at one focus.
1577 – Studied at Leonberg — the year, as he himself tells us, of a great comet; but domestic bankruptcy occasioned his transference to field work, in which he was exclusively employed for several years.
1588 – A brilliant examination for the degree of bachelor procured him admittance on the foundation to the university of Tübingen, where he laid up a copious store of classical erudition, and imbibed Copernican principles from the private instructions of his teacher and lifelong friend, Michael Maestlin.
1595 – He notes with exultation the 9th of July, as the date of the pseudo-discovery, the publication of which in Prodromus Dissertationum Cosmographicarum seu Mysterium Cosmographicum (Tübingen) procured him much fame, and a friendly correspondence with the two most eminent astronomers of the time, Tycho Brahe and Galileo Galilei.
1600 – He received definitive notice to leave Graz, and, having leased his wife’s property, he departed with his family for Prague.
1603-1606 – He dedicated to the emperor a treatise on the "great conjunction" of that year (Judicium de trigono igneo); and he published his observations on a brilliant star which appeared suddenly (September 30th), and remained visible for seventeen months, in De stella nova in pede Serpentarii (Prague).
1609 – The "great Martian labor" being at length completed, he was able, in his own figurative language, to lead the captive planet to the foot of the imperial throne.
– He wrote "Astronomia Nova de Motibus Stellae Martis ex Observationibus Tychonis Brahe" (announcing first and second laws) and "Harmonice Mundi" (announcing third law).
1611 – He had welcomed with a little essay called Dissertatio cum Nuncio Sidereo Galileo’s first announcement of celestial novelties; he now, in his Dioptrice (Augsburg), expounded the theory of refraction by lenses, and suggested the principle of the "astronomical" or inverting telescope.
-The death by smallpox of his favorite child was followed by that of his wife, who, long a prey to melancholy, was on the 3rd of July carried off by typhus.
1612 – Retained his position as court astronomer, to accept the office of mathematician to the states of Upper Austria.
– He was excommunicated from the Lutheran Church.
1617 – He declined the post of successor to G. A. Magini in the mathematical chair of Bologna.
1630 – He died on November 15th in Regensburg, Germany.