In this tutorial, we’re going to learn how you can create a flexible day-night cycle leveraging the power of Curves.
https://dev.epicgames.com/community/learning/tutorials/Gpqd/unreal-engine-creating-a-flexible-day-night-cycle-with-curves
Hey LenNerd!
I found your guide while looking around for some help doing this based off a curve so that the sky doesn’t just go black. Dawn and Dusk.
I am having a few issues following your guide. I am brand new to coding so I reckon it is my inexperience. I am having issues particularly with the logic for the rotation function. The guide skips right over the SET node after the function, what exactly is it I am setting there, and where does the “Light to Rotate” input pin come from. I have tried both my variables but neither have that “Light to Rotate” pin. Thank you so much for your time!
Hey there! Thanks for checking out my tutorial 
The “Light to Rotate” variable is a local variable set right at the start of the “Rotate Light” function. It’s set to the value of the “Light” input. This is a method I use to keep my connections organized. I can just reference the local variable instead of having to drag lines from the Light input variable, but you can also do that. It’s really just personal taste.
I hope this cleared things up! If you have any other questions, post them here. I’d be happy to answer them