How did Kepler propose the planets moved? Why was this understanding important in Astronomy?

Question

please answer in a short answer

Answer 1

http://en.wikipedia.org/wiki/Kepler

Answer 2

keppler's laws are the laws that govern planetary motion. These are the three laws previously stated above. Its greatest implication in astronomy is that we now understand how planets move, and also it became the basis for satellites. Satellites move similar to the planets in space, thus making it also the law that govern satellite motion.

Answer 3

as we all know in experimental physic, observation play it role in discovering this and in the same time he refered to book wrote by ancient Aristotelean, Ptolemaic, and Copernican..from observation he create kepler law of planetary motion..

1.The orbit of every planet is an ellipse with the sun at one of the foci. An ellipse is characterized by its two focal points. Thus, Kepler rejected the ancient Aristotelean, Ptolemaic, and Copernican belief in circular motion.

2.A line joining a planet and the sun sweeps out equal areas during equal intervals of time as the planet travels along its orbit. This means that the planet travels faster while close to the sun and slows down when it is farther from the sun. With his law, Kepler rejected the Aristotelean astronomical theory that planets have uniform speed.

3.The squares of the orbital periods of planets are directly proportional to the cubes of the semi-major axes (the "half-length" of the ellipse) of their orbits. This means not only that larger orbits have longer periods, but also that the speed of a planet in a larger orbit is lower than in a smaller orbit.

by the discovery of this we can predict the movement of planet with great accuracy..sorry because i write this answer to long.i just want to make sure you understand..i hope this help.

Answer 4

He discovered that the planets orbited the Sun in ellipses, not perfect circles as previously believed. It was the work of Kepler that led to Newton's laws of gravitation.