The mutual gravitational forces that attract a planet and the sun to each other
are responsible for keeping the planet in orbit around the sun.
According to Kepler's laws of planetary motion, planetary orbits are in the shape of an ellipse with the Sun at one of the foci.
They all obey Kepler's 3 laws of planetary motion.
Johannes Kepler is credited with forming the mathematics of elliptical orbits.
There are numerous theories of planetary motion. Ptolemaeus (earth in the centre), Copernicus (the sun in the centre, planets orbit around it), Kepler (planet orbits are ellipses) all wrote such theories.
Newton's theories, primarily articulated in his laws of motion and universal gravitation, describe how objects interact through forces, emphasizing the mathematical relationships between mass, distance, and gravity. In contrast, Kepler's theories focus on the motion of planets, specifically their elliptical orbits around the sun, outlined in his three laws of planetary motion. While Kepler's work provided the observational framework for planetary motion, Newton's laws offered the underlying physical principles that explain why those motions occur. Essentially, Kepler described the "how" of planetary motion, while Newton explained the "why."
because without it we would not have the same gravity or we wouldn't stay on our axis
Gravity.
Only one force - gravity.
weight
Gravity
Gravity is completely responsible for planetary motion. The shape and size of each orbit, and the speed of the planet at every point in its orbit, taken along with the mass of the sun, are completely determined by the behavior of gravity.
Projectile motion has two components horizontal motion and vertical motion. Gravity affects only the vertical motion of projectile motion.
Isaac Newton
He didn't alter them. He showed that his theory of planetary motion under gravity was consistent with them.
Sin no
Newton's three laws of motion describe how forces affect motion. They have nothing to do with gravity, except that gravity is one of many possible causes of force.
Rotation and revolution. Gravity and Inertia. See Kepler's Law of Planetary motion.