We Know – The Sun Is Very Big
Copernicus’ major theory was published in De revolutionibus orbium coelestium
. It listed the “assumptions” upon which the theory was based as follows:
1. There is no one center of all the celestial circles or spheres.
2. The center of the earth is not the center of the universe, but only of gravity and of the lunar sphere.
3. All the spheres revolve about the sun as their mid-point, and the sun is the center of the universe.
4. The ratio of the earth’s distance from the sun to the height of the firmament is smaller
than the ratio of the earth’s radius to its distance from the sun that the distance from the earth to the sun
is imperceptible in comparison with the height of the firmament.
5. Whatever motion appears in the firmament arises not from any motion of the firmament,
but from the earth’s motion. The earth together with its circumjacent elements performs a complete rotation
on its fixed poles in a daily motion, while the firmament and highest heaven abide unchanged.
6. What appear to us as motions of the sun arise not from its motion but from the motion of
the earth and our sphere, with which we revolve about the sun like any other planet. The earth has, then,
more than one motion.
7. The apparent retrograde and direct motion of the planets arises not from their motion
but from the earth’s. The motion of the earth alone, therefore, suffices to explain so many
apparent inequalities in the heavens.