Because Jupiter is about 5.2 times further from the Sun than the Earth, the Sun would be (5.2)^2 = 27 times fainter, but still too bright to look at directlywithout properly shielding the eyes. The sun's disk would have an apparent sizeof about 1/5th what we see at the Earth, or 6 arcminutes. This means we wouldprobably not tell with the naked eye that it has a distinct disk as we do at sunrise and sunset. It would, instead, look like an extremely bright star.
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