jan 1, 1619 - Kepler published his third law about planetary motion
Description:
The three laws state that: The orbit of a planet is an ellipse with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its orbit.Added to timeline:
Date:
jan 1, 1619
Now
~ 406 years ago