27 December 2013

Happy birthday, Kepler.


Johannes Kepler was born on this date in 1571.

It should not be considered unbelievable that one can retrieve useful knowledge and sacred relics from astrological folly and godlessness. From this filthy mud one can glean even an occasional escargot, oysters or an eel for one's nutrition; in this enormous heap of worm-castings there are silk-worms to be found; and, finally, out of this foul-smelling dung-heap a diligent hen can scratch up an occasional grain-seed -- indeed, even a pearl or a gold nugget.

Johannes Kepler

Johannes Kepler and Planetary Motion, part 1 ...



Johannes Kepler and Planetary Motion, part 2 ...

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