Yes, but Cerys is a moon of Fulgora...

Hi, yeah, Cerys is a moon of Fulgora, but I replaced its home planet, Fulgora, and placed it in orbit around a gas giant.

so you need to fix it in planet description i guess, because it`s still moon of fulgora)

To change a planet's description in another mod, you have to directly modify the global settings—something only the mod's developer can do. It's a shame, but that's just how it is.

To change a planet's description in another mod, you have to directly modify the global settings

This statement is wrong on at least two levels:

1. Planet descriptions that appear in-game are contained in the respective language's locale file (check the locale folder to see the various folders containing cfg files); this is not related to "global settings" in any way
2. Other mods CAN override these in-game descriptions from within a third-party mod (that is basically what Rubia Alt Cut does)

You can very easily change the planet descriptions from within this mod

I’m still figuring things out, so I’ll get back to you later. But would this count as interfering with someone else’s mod and changing it—even the description—without their consent? I’ll reach out to the developer to see if they’re okay with it. If so, thanks for the explanation; I’ll take it into account. 🙏

While I was focusing on the new idea for the Shuttle Reconstruction mod, I'd actually been thinking for a while about creating flights via a passenger shuttle to the platform; in my opinion, that would be awesome

| would this count as interfering with someone else’s mod and changing it

If it's a change that is needed for your own overhaul, I wouldn't call that "interfering". By definition, the simple act of moving Cerys away from Fulgora could already be considered "interfering".

I would just make the minimal changes necessary (i.e. copy over the sections that need to be changed, remove the parts involving Fulgora, then reword them to reference the new location, or just omit any reference to its location)

I think that, for the most part, by including a link to the developer’s mod in my description, I’ll make sure to mention—once I update the mod—that I used it as the basis for my solar system mod, so thanks to the modders for their planet designs.
Right now I’m just focused on something else, but if it’s a concern, I’ll update the descriptions; that would be