# What is Keplers Law of Planetry Motion ?

Johannes Kepler proposed three laws of planetary motion. Kepler described the motion of planets in a sun-centered solar system. Kepler’s efforts to explain the underlying reasons for such motions are no longer accepted; nonetheless, the actual laws themselves are still considered an accurate description of the motion of any planet and any satellite.

Kepler’s first law

The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus.

###### In other words we can explain this as :

Planets are orbiting the sun in a path described as an ellipse.An ellipse is a special curve in which the sum of the distances from every point on the curve to two other points is a constant.The two other points are known as the foci of the ellipse.

Kepler’s second  law

The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.

###### In other words we can explain this as:

Sometimes referred to as the law of equal areas – describes the speed at which any given planet will move while orbiting the sun. The speed at which any planet moves through space is constantly changing. A planet moves fastest when it is closest to the sun and slowest when it is furthest from the sun.

Kepler’s third  law

The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.

###### In other  words we can explain this as :

The third law makes a comparison between the motion characteristics of different planets. The comparison being made is that the ratio of the squares of the periods to the cubes of their average distances from the sun is the same for every one of the planets compares the orbital period and radius of orbit of a planet to those of other planets.

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