March 8 1619 –
Johannes Kepler’s three laws of planetary motion provided evidence that the planets, including the Earth, orbit the Sun in an oval shape and that a planet’s speed varies at different stages of its orbit. The German astronomer’s first two laws were published in 1609. His third law, which he discovered on this date, was outlined in Harmonice Mundi (Harmony of the Worlds) ten years later.
So that and $2.75 will get you a ride on the NYC subway.
And so it goes
The Haus of Dcaligari 