Unity3d skybox rotation script

using UnityEngine;
using System.Collections;

[ExecuteInEditMode]
public class SkyboxSetup : MonoBehaviour
{
	public float RotationDegree;

	// Update is called once per frame
	void Update ()
	{
		Quaternion rotationDegree = Quaternion.AngleAxis(RotationDegree, Vector3.up);
		Matrix4x4 rotationShader = Matrix4x4.TRS(Vector3.zero, rotationDegree, Vector3.one);
		RenderSettings.skybox.SetMatrix("_Rotation", rotationShader);
	}
}