private void Awake()
 {
     if (instance != null && instance != this)
     {
         Destroy(this);
     }
     else
     {
         instance = this;
     }
 }
    protected override JobHandle OnUpdate(JobHandle inputDeps)
    {
        float  deltaTime        = Time.DeltaTime;
        float3 centerWorldPoint = new float3(0, 0, 0);

        var jobHandle = Entities.WithName("RotatePlanetsSystem").
                        ForEach((ref Translation position, ref Rotation rotation, ref RotationSpeed rotationSpeed, ref PlanetTag planetTag) =>
        {
            position.Value = ECSDataManager.RotateAroundPoint(position.Value, float3.zero, math.up(), 0.02f * deltaTime);
            rotation.Value = math.mul(math.normalize(rotation.Value), quaternion.AxisAngle(math.up(), rotationSpeed.Value * deltaTime));
        })
                        .Schedule(inputDeps);

        jobHandle.Complete();

        Entities.WithoutBurst().WithStructuralChanges()
        .ForEach((ref Translation position, ref PlanetTag planetTag) =>
        {
            ECSDataManager.UpdatePlanetPosition(planetTag.ID, position.Value);
        })
        .Run();

        return(jobHandle);
    }