Hey there.

I don't know if this is possible, but could you include compatibility with Botania's Garden of Glass Sky? More specifically have the rainbow and planets overlay on top of the Stellar Sky's night time sky?

I understand if this isn't possible, just that if it's not possible, I'll have to choose between the two (Hard Decision).

Or maybe - even though its not realistic, could you incorporate a similar 'rainbow' and planet shapes?

Thank you anyway.

Sorry for late reply.
This is hard because there is only one way to modify sky rendering: set sky renderer. So no way to incorporate sky of other mods.
But I'll try.
Also I'll probably introduce ring systems.

Let me know what happens with the recently released version. You need to enable Render_Other_Modded_Skybox which is in dimension-specific settings.

Commit ab2710c should be satisfactory.