Heliocentric
- models have been presented to prove geocentrism wrong
actually, by the times of Copernicus works, geocentrism was more precise than heliocentrism. It's because Copernicus postulated orbits should be perfect circles (because God's Creation must be perfect) althought orbits are actually ellipses.
On the other hand, geocentrism had a long history of adaptations like a complex system of epicycles ("circle on the circle") in order to explain the apparent retrograde motion of planets.
At least, Copernicus model allowed easier but less precise calculations
- earth is round
of course, but more important: its rotation. Because of Earth rotation around its axis, all the sky seems to revolve around us.
- earth rotates/ revolves around the sun
yes but Earth and all other planets
- we are 1 galaxy of billions
not the subject. heliocentrism is only about Solar System. Copernicus didn't said stars were like our Sun nor some of them could have a planetary system.