I have a suggestion to your mod, that can be implemented easily!
So, from the title, if you adjusted planets size relying on their gravitational force, it's also be very cool if you adjust rotation of every planet based on their own day night cycle.
Let me know if you need help implementing this :)

That's all Visible Planets internal runtime code. My mod only touches data stage stuff so you have to take it up with Nauviax to expose an endpoint which I can hook into. Also since the planets and their moons are all one single combined sprite, I can't rotate the moons individually from the planet.

It's sad, Nauviax didn't plan to implement these features due to being busy..