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$\begingroup$ Why would such a planet be half-illuminated (which is the question)? $\endgroup$
– ProfRob
Commented Oct 6, 2023 at 6:05
$\begingroup$ If a planet is synchronised, then it of course will be half-illuminated. I just wanted to emphasise that not all close planets are synchronised. That's all what I wanted to add. $\endgroup$
– Michael_1812
Commented Oct 6, 2023 at 15:06
1

$\begingroup$ The 3:2 case with high eccentricity is also quite interesting. $\endgroup$
– leftaroundabout
Commented Oct 6, 2023 at 15:51

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