Galileo and Copernicus taught that the sun was the center of the universe. That's what heliocentric means. From a modern perspective that is only slightly less ridiculous than the theory that the earth is at the center.
Well, if it's even slightly less ridiculous then it can't be just as innacurate. :)
In fact, we can probably approximate it as less innacurate by an order of 332,946 magnitudes. ;)
Slight modification. It appears that Galileo believed the sun to be one of many stars. I believe Copernicus taught true heliocentrism, that all heavenly bodies, including of course the stars, orbited the Sun.