# KEPLER’S LAWS

Kepler’s law was named after Johannes Kepler who was in Germany.  Johannes Kepler proposed three laws of planetary motion in the 1600s.  The Kepler made a good summary of the data collected pertaining to three statements that describe the planet’s motion in the sun-centered solar system by Tycho Brahe who was his mentor.  The Kepler’s effort of trying to explain the reasons for the motions are no longer important.  The Kepler’s laws are the law of Ellipses, law of equal areas and law of harmonies.  Law of ellipses is the first Kepler’s law and it is defined as the planet’s path around the sun takes elliptical shape where the sun is located at the focus. Ellipse is a curve where the distance from the specific point of the curve is constant.  Law of an ellipse is the simplest law of the three Kepler’s law. Law of equal areas is the second Kepler’s law and it is described as when an imaginary line is drawn from the center of a sun to the planet’s center, the equal areas will be swept out at intervals.  The speed in which the planet moves is usually changed constantly. According to this law, the planet moves fastest when it is close to the sun and slowest when it is furthest to the sun. The law of harmonies is the third Kepler’s law and it is described as the ration of periods of two planets that is equal to the cubes’ ratio of the average distance from the sun. Law of harmonies makes a good comparison between motions of various planets unlike the law of ellipse and law of equal areas that describes the motion characteristics of the single planet.  Law of harmonies is known to give correct information of the distance and period of the planet orbit around the sun.

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