Nothing new, just a Multi Layer Skybox shader

The shader supports hue shifting as well as saturation, you can make day/night cycle with this pretty easily.

Bonus: You can use the front layer of your cubemap as a distance fog and combine it with the default fog in Environment tab.

Note: The shader based on normalized position, so if you want to be based of ViewDirection instead, you can just delete the postion and normalize nodes and change it to ViewDir node. Tho you must inverse the matrix or else it will be flipped

Thanks!

To Do :
SmoothStep
Dynamic rotation