|Make a wish!|
While at the University of Tubingen, Kepler studied both the Ptolemaic system (geocentric) and the Copernican system (heliocentric) of planetary motion, becoming a Copernican. As a student, Kepler defended heliocentrism from both a theoretical and theological perspective, maintaining that the Sun was the principal source of motive power in the universe.
|That is one powerful beard!|
While at this post, Kepler became exceedingly productive. Kepler learned of the work of Italian physicist and astronomer Galileo Galilei, who had discovered mountains and craters on the moon as well as four moons of Jupiter with a telescope he had invented. Kepler later corresponded with Galileo, obtaining a telescope of his own and improving upon the design. Somewhere along the way, Kepler found the time to publish his three laws of planetary motion, as well as several scientific works and validation of Galileo's works. Among his studies and calculations, Kepler came up with a calculation for the beginning of the universe: April 27, 4977 BC.
I honestly have no idea what was taken into consideration for this computation, but Kepler did not employ any calculating assistants (back then, you hired your calculators, rather than buying them from Texas Instruments), so for having to do the math all by himself, he didn't do too badly. Granted, the universe really is something like 13.75 billion years old, but he's only off by 214,843,750%!
So sit right back, universe, and grab yourself a slice of cake. You've got to have a birthday sometime, why not today?