Love this sky.
Do you want to see my enhanced version (mostly by an LLM)?
I needed a 2nd light source for the moon and adjustment for the horizon and how fast the sunset will fade.
Only if you are interested, would call my version a little bit sloppy.
Some of the logic is outside of the shader. I can define here how long the day and how long the night will be. Not fixed 50:50. But that would require a complex asset, not just a shader.