Most distant visible object in the daytime sky - Venus?
Looking up at the clear blue sky in the UK this afternoon Venus can easily be seen, just above and slightly to the left of the Moon. This for some reason reminded me of a tiebreaker question in an ancient BBC quiz show "Ask The Family" which ran something like "You are stood on top of the Eiffel Tower on a clear day, what is the most distant thing you can see?". The given answer was "The Sun". Now excepting once in a millennium exceptions such as nova of various sorts I'm wondering whether Venus could be the answer. A quick google shows that currently this is not the case - the current separation of Earth and Venus is ~0.75 astronomical units. But could it be the case that Venus is visible by somebody with reasonably typical sight when the Sun is above the horizon and the Earth-Venus separation is greater than 1 A.U.? Or will Venus always be too close in the sky to the Sun?
If you know exactly where to look, with extremely clear skies, good vision, and the right positioning, Jupiter's visible during the daytime, and is always further from Earth than Venus or the Sun.
Observing Jupiter doesnât require waiting for complete darkness; itâs bright enough to be spotted during twilight. In fact, you can even catch a glimpse of Jupiter in broad daylight if you know where to look!
Ideal conditions for daytime viewing of Jupiter include a clear, haze-free sky. To the naked eye, the planet will appear as a bright pinprick of light, but a good pair of binoculars or a telescope will reveal it as a small, pale disk.
https://lowell.edu/jupiter-during-daylight-why-it-happens-and-how-to-view-it