Celestial Configuration for Forge 1.20.1 causes the stars to freeze in the sky:
https://medal.tv/games/minecraft/clips/hYfrIGPCgnR7ulLB6/d13374uTjlOi?invite=cr-MSxhancsMzMwNjk5MzQs
Forge Version: 47.2.19

Please provide a full modlist, as well as try reproducing the issue without any resource packs or shaders enabled.

The original video was with a custom modpack, but the issue persists even with only this mod installed without resourcepacks or shaders.

I'm having the same issue, it's like the skybox is following your view.

fixed in version 1.1.1