What are the 3 Kepler's laws?

Answer 1

There are no fundamental laws behind the Copernican theory. The three laws of planetary motion that we use now were discovered by Johannes Kepler and published in 1609, sixty-six years after Copernicus died.
Kepler introduced the new idea of elliptical orbits. The idea that the Sun is at the centre (loosely speaking) was the only part of the Copernican theory that Kepler retained.

Answer 2

First: all planets travel in an elliptical orbit with the Sun at one focus

Second: if a line is drawn from the Sun to a planet, the area that the line sweeps across is equal at different distanes for equal times

Third: There is a relationship between the distances of a planet from the Sun and it's speed

Answer 3

1. The Law of Ellipses: Planets orbit the sun in elliptical paths, with the sun at one of the foci.
2. The Law of Equal Areas: A line segment joining a planet and the sun sweeps out equal areas during equal intervals of time.
3. The Law of Periods: The square of the orbital period of a planet is proportional to the cube of its semi-major axis.

Answer 4

Kepler's work effectively eliminated the idea of uniform circular motion as well as the idea of crystalline spheres revolving in circular orbits.