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... and in what sense is "the sun is the center of the universe" not completely wrong?In a sense that there's no obvious preferred reference frame (and if you believe Einstein, there's none at all) for the universe, so you may as well pick up the sun to be (0, 0, 0).
Also, as long as you adjust for the observable evidence, the only difference between heliocentric and geocentric model is how much are you willing to complicate your maths. Those two descriptions can always be translated into one another.
This is really an important point many people miss about science, and well, about thinking itself. There are many equivalent ways to describe a given phenomena, taking into account all available evidence, and the model we pick as "official" is usually the simplest one.