Weird rotation Log that makes no sense ?

Hello, I am trying to program a day and night cycle, by rotating the sunlight and a moonlight.

     pivot.transform.Rotate (Vector3.up * cycleTimeMult * Time.deltaTime);

     Debug.Log (daytime.ToString ());

     //handle more
     if (daytime <= 0) {    //if nighttime
         sunLight.intensity = 0;
         nightLight.intensity = 1;
     } else {
         sunLight.intensity = 1;
         nightLight.intensity = 0;
     }

When I try to get the rotation, it logs somehting like -0.7069825 , and over time it is zero and goes back and after some cycles it switches to positive and its really weird. I can't determine what time of day it is when the rotation is something like -0.7 then 0 and after 2 days 0.3 or something.