Ill work our a solution for you but you have to close the gap from daytime to your skybox. Wich means use those magical math formulars and get a daytime 0-24 and you should be set with the stuff ill upload soon
Edit: Please be patient… ill use such stuff to teach stuff to myself 
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Edit: Just making assets… i guess my machine is going to explode soon :S
Edit: Pure Scene Set. Implementing your Day/Night Cycle Now
