Galelei derived his theory from Copernicus. To Copernicus it was just a theory. Galilei managed to prove it when he invented the telescope and was able to see the moons orbiting Jupiter.
Copernicus believed the planetary motions were due to:
Copernicus created the mathematical theory to prove that the Sun, not the Earth, was the centre of our solar system. Galilei provided the calculations and observations to prove Copernicus' theory.
Copernicus was in 1543, a polish astronomer named Nicolaus Copernicus. Copernicus's theory - The sun is at the center of the Universe. Galileo Galilei was in 1609, Galileo became the first person to use a telescope to observe celestial bodies.
Nicolaus Copernicus (1473 -- 1543) is a famous Polish Astronomer.
Actually Aristole didn't conclude this theory. Gallileo proved the Earth was round. Eratosthenes of Cyren put the idea out in the open, but Nicholas Copernicus and Galileo Galilei showed the theory to the public.
Galileo Galilei . He only helped support the theory through his observations , he didn't invent the model, Copernicus did.
Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
Copernicus' theory was that Earth is not the center of the universe and we revolve around the Sun.
A hypothesis is an educated guess on the possibility of some phenomena while a scientific theory is when the phenomena is confirmed by observation.
Nicolaus Copernicus
Galileo Galilei noted that; if our Earth and other planets went around our Sun, Venus would exhibit phases like our Moon; but if our Sun and other planets went around our Sun, it wouldn't. GG looked at Venus over the course of several weeks and noted unmistakeable phases. He thus concluded that the Copernican model was not just a useful model for calculation, but supported by observation.
Copernicus.