I put a simple box object into a scene to check the effect, with my camera near
the origin. Try using a backwards rotation-- I do see the changing light effect
then.

Like,  +K-30 on the command line.



           ....
          finish { diffuse 0 ambient 1 } //POV-Ray 3.6.
             //or
          finish { diffuse 0 ambient 0 emission 1 } //POV-Ray 3.7.
       }
    }
       rotate <clock,0,0>
 }

I do notice that, past some some positive rotation angle, the light looks like
it disappears(?). Maybe the Sun is moving below the horizon, based on V_SUN's
original position?

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