What was keplers theory?

Answer 1

He was the first person to suggest that the planets don't move in circles and the planets don't always move at the same speed all the time. He and Isaac newton made more accurate predictions than the other scientists e.g. Artistotle, Ptolemy, Copernicus, Tycho Brahe.

Answer 2

In astronomy, Kepler's laws give a description of the motion of planets around the Sun.

Kepler's laws are:

1. The orbit of every planet is an ellipse with the Sun at one of the two foci.
2. A line joining a planet and the Sun sweeps out equal areas during equal intervals of time (this is otherwise stated as the law of conservation of angular momentum).
3. The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

Answer 3

Kepler's theory of planetary motion, published in the early 17th century, described the motion of planets around the sun in elliptical orbits. He formulated three laws of planetary motion known as Kepler's laws, which provided a quantitative description of how planets move in their orbits based on observations made by Tycho Brahe.

Answer 4

The planets orbit the sun in ellipses.