Degree measurement between two objects : bug

Hello everybody,

i am in big need to measure the relation between object A and Object B in terms of degrees. What do i mean? Imagine a compass. You stand somewhere (your Character Object), you rotate and it shows towards north --> you can now how your relation is towards north. In my implementation north would be exactly 180 degree: than i would face it. If i stand to the opposite it would be 0.

Now i don't want the degree relation between the Character and North, but between him and different Collides in the Game. So i can direct him towards them.

I have kind of working code, but it has few bugs, i will describe below it

     float sign;
     float angle;
     Vector3 targetDir;
     Vector3 forwardDir;
     Vector3 referenceRight;
     float finalAngle;
     Transform target;
 
     void Start ()
     {
         target = GameObject.Find("Cube").transform;
     }
 
     void Update () {
         targetDir = target.position - transform.position;
         forwardDir = transform.forward;
         angle = Vector3.Angle(targetDir, forwardDir);
 
         referenceRight = Vector3.Cross(Vector3.down, forwardDir);
         sign = Mathf.Sign(Vector3.Dot(targetDir, referenceRight));
 
         finalAngle = sign * angle;
 
         if (finalAngle < 180) { finalAngle = finalAngle + 180; }
         else if (finalAngle > 180) { finalAngle = finalAngle - 180; }
 
         Debug.Log(finalAngle);
 
     }

This code is attached to the first person Player and i have tested it with Small and Big Colliders, Cubes and so on. And it works just fine, except for one bug.

BUG:

• If i am standing close to the collider or the Cube or what ever is my target for degree calculation, the degree will jump between let's say 160-180.

• If i go even closer, it will jump between 150-190!

The closer i am to the target, the more degrees are jumped over in the front !!!

I would really appreciate any solution. I thought about making a very small object in the collider towards it should point, but it did not help. I decreased the body of the first person character and made him very thin, did not help either ...

thank you very much in advance :)