And where is Nibuhura or whatever now? These fairy tales might have worked a few centuries ago, but today we have a lil' thing called "technology". Even in the hands of an Amazon shopper, we can view most of our neighbors in this solar system. If a stellar body were, as you claim, is in opposition to Jupiter, it would be visible to Earth for much of the year. See, the Earth's orbital time is much faster than Jupiter's.

So again, where's your proof?