That's only obvious if you're looking at Jupiter from the outside!
You could imagine primitive aliens on the various moons each believing their own is the center of the Jupiter system, which is an elaborate world of epicycles. And when they communicate with the aliens of the other worlds (over shortwave radios each time the moons fly past each other), they debate Europacentrism and Ganymedocentrism and get into very heated arguments.
You could imagine primitive aliens on the various moons each believing their own is the center of the Jupiter system, which is an elaborate world of epicycles. And when they communicate with the aliens of the other worlds (over shortwave radios each time the moons fly past each other), they debate Europacentrism and Ganymedocentrism and get into very heated arguments.