What are 6 early ideas about planetary motion?

Question

i mean 2 early ideas about planetary motions?

Answer 1

A very early one was: The planets revolved around the Earth.

A somewhat later one was: Planets revolve in a perfect circle.

Answer 2

Johannes Kepler's primary contributions to astronomy/astrophysics were his three laws of planetary motion. Kepler, a German mathematician, derived these laws, in part, by studying the observations of the legendarily precise Danish astronomer Tycho Brahe. The article on Johannes Kepler gives a less mathematical description of the laws, as well as a treatment of their historical and intellectual context.

Kepler's work was vital to the later acceptance of Sir Isaac Newton's three laws of motion and his law of universal gravitation. Newton was able to deduce Kepler's laws using his invention of calculus. It is possible to see from this argument that other models of gravitation would give empirically false results.

Johannes Kepler's primary contributions to astronomy/astrophysics were his three laws of planetary motion. Kepler, a German mathematician, derived these laws, in part, by studying the observations of the legendarily precise Danish astronomer Tycho Brahe. The article on Johannes Kepler gives a less mathematical description of the laws, as well as a treatment of their historical and intellectual context.

Kepler's work was vital to the later acceptance of Sir Isaac Newton's three laws of motion and his law of universal gravitation. Newton was able to deduce Kepler's laws using his invention of calculus. It is possible to see from this argument that other models of gravitation would give empirically false results.

Johannes Kepler's primary contributions to astronomy/astrophysics were his three laws of planetary motion. Kepler, a German mathematician, derived these laws, in part, by studying the observations of the legendarily precise Danish astronomer Tycho Brahe. The article on Johannes Kepler gives a less mathematical description of the laws, as well as a treatment of their historical and intellectual context.

Kepler's work was vital to the later acceptance of Sir Isaac Newton's three laws of motion and his law of universal gravitation. Newton was able to deduce Kepler's laws using his invention of calculus. It is possible to see from this argument that other models of gravitation would give empirically false results.