![]() Then begin to trace out a path with the pencil, keeping the string wrapped tightly around the tacks. Take your pencil and pull the string until the pencil and two tacks make a triangle (see diagram at the right). ![]() Then tie the string into a loop and wrap the loop around the two tacks. Tack the sheet of paper to the cardboard using the two tacks. An ellipse can easily be constructed using a pencil, two tacks, a string, a sheet of paper and a piece of cardboard. Kepler's first law - sometimes referred to as the law of ellipses - explains that planets are orbiting the sun in a path described as an ellipse. The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun.An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time.The path of the planets about the sun is elliptical in shape, with the center of the sun being located at one focus.Kepler's three laws of planetary motion can be described as follows: 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 was able to summarize the carefully collected data of his mentor - Tycho Brahe - with three statements that described the motion of planets in a sun-centered solar system. In the early 1600s, Johannes Kepler proposed three laws of planetary motion.
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