Aristarchus developed a sun centered solar system, similar to our present model. His moon was smaller than ours, and not as far away. I think he estimated that the sun was something less than 20 million miles away--although he did believe it was larger than the earth.
http://www.physics.purdue.edu/astr263l/SStour/history/
This is the point in the sky that is directly over your head at any time
Ptolemy
They all obey Kepler's 3 laws of planetary motion.
They are in the shape of an ellipse.
Silicon Sandy
The true shape of planetary orbits was discovered by Johannes Kepler in the early 17th century. He formulated three empirical laws, now known as Kepler's Laws of Planetary Motion, which describe the motion of planets in the Solar System. These laws are as follows: The orbit of each planet is an ellipse with the Sun at one of the two foci. A line joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.Kepler's Laws of Planetary Motion provide a mathematical description of the motion of planets in the Solar System and explain why planets move in elliptical orbits around the Sun.
Superior planets are in opposition when in the middle of their retrograde motion.
Kepler
The laws of planetary motion are attributed to Kepler.
3 laws' of planetary motion
Keplar figured out the laws of planetary motion using Tycho Brahe's data.
He is credited with the most accurate astronomical observations of his time, and the data was used by his assistant Kepler to derive the laws of planetary motion.
He is credited with the most accurate astronomical observations of his time, and the data was used by his assistant Kepler to derive the laws of planetary motion.
They all obey Kepler's 3 laws of planetary motion.
They are in the shape of an ellipse.
His laws of planetary motion.
Johannes Kepler
sepa putas
No. Kepler discovered the laws using Tycho Brahe's data.