1 Jan 1619 Jahr - Kepler published his third law about planetary motion

Beschreibung:

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.

Zugefügt zum Band der Zeit:

Datum: