Update atmospheric fog after move directional lights

Hi,
I’m currently have on the scene two directional lights: sun and moon. When sun is above landscape, moon is under and when moon is above landscape, sun is under. Both are checked as “Use as atmosphere sun light” because I need to affect atmospheric fog by both lights. Unfortunately it doesn’t work as I expected. When sun is moving under landscape and moon above, atmospheric fog doesn’t update and is not affected by light because sun is under landscape! Then I want “switch” atmospheric fog to affect by moon…

I’ve attached screenshot where you can see what about I’m writing…

Is it possible? I need this to make my dynamic time of day and weather…

Wishes,

I posted here