What is Kepler’s Law?: Definition with Example

1.    Kepler’s Law:  Kepler give 3 law related to planetary motion which are-

1.Law of orbits : All planets move in elliptical orbits with the Sun situated at one of the foci of the ellipse.

Here F1 and F2 are foci , A1 and A2 are area

2. Law of areas : The line that joins any planet to the sun sweeps equal areas in equal intervals of time (Fig. 8.2). This law comes from the observations that planets appear to move slower when they are farther from the sun than when they are nearer.
3. Law of periods : The square of the time period of revolution of a planet is proportional to the cube of the semi-major axis of the ellipse traced out by the planet.