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$\begingroup$ I am afraid that some people have considered other lower limits for orbiting moons. Their calculations indicate tht the maximum angular diameter of a giant planet viewed from its habitable or potentially habitable moon would be much less than you calculate. See part five of my answer. $\endgroup$
– M. A. Golding
Commented Mar 31, 2021 at 2:18
$\begingroup$ @M.A.Golding their concerns center around tidal heating, specifically giving the example of Io. I have already handwaved that away by observing that Io's heating is the result orbital eccentricities driven by orbital resonance with other large moons. In the absense of additional large moons, the orbit will be circularised and tidal heating will be negligible. $\endgroup$
– Starfish Prime
Commented Mar 31, 2021 at 6:57
$\begingroup$ @StarfishPrime Very nice answer and I think it complements the other answers well. I had not taken the horizon calculation into consideration, instead going for the approximation of a circular disk, which for close objects starts to fall apart. For the maximum size of a 'Jupiter', while taking into consideration radiative heating: I found that gas giants in the Jupiter range (up to 13 Mj) do not change in radius that much. And even Saturn is not that much smaller while being 30% of Mj. $\endgroup$
– L. IJspeert
Commented Mar 31, 2021 at 7:59
$\begingroup$ @tarfish Prime Part three of my aswer to: worldbuilding.stackexchange.com/questions/200498/… Discusses another type of astronomical situation were two astronomical objects can have very large angular diameters in each other's skies. Possibly the largest angular diameters which are possible. $\endgroup$
– M. A. Golding
Commented Apr 12, 2021 at 3:16

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