Question Rotating directional light in AR scene

I'm trying to rotate a directional light to match the position of the real sun. To do so I'm using the trueHeading variable from the compass of the phone, and an API which reads the position of the sun with respect to the current location. All of this values have been tested and they all seems to be correct. However, when I try to rotate only around y-axis a rotation is also made on the x-axis, and also the rotation does not seem to be right for the y-axis.
The prints for all the variables both before and after the rotation looks like this, and the corresponding images can be seen below:

First values:
Compass = 356,0083

Before rotation:
PlayerYBefore = 356,0083

SunXBefore = 45

SunYBefore = -1,207418E-06

SunZBefore = 157,02


After rotation:
PlayerYAfter = 356,0083

SunXAfter = 2,762822

SunYAfter = 44,04689

SunZAfter = 351,0968




Second values:

Compass = 40,28704

Before rotation:
PlayerYBefore = 40,28704

SunXBefore = 2,762822

SunYBefore = 44,04689

SunZBefore = 351,0968

After rotation:

PlayerYAfter = 40,28704

SunXAfter = 357,0963

SunYAfter = 349,5582

SunZAfter = 343,696
Default placement


First rotation



Last rotation

Code (csharp):

1.  
2. using System;
3. using System.Collections;
4. using System.Collections.Generic;
5. using UnityEngine;
6. using IpGeoLocApiv2;
7.  
8. public class SetSunPosition : MonoBehaviour
9. {
10.  
11.     float timer = 0;
12.     public GameObject player;
13.     public GameObject sun;
14.  
15.     // Update is called once per frame
16.     void Update()
17.     {
18.         // How often do we update sun position
19.         timer += Time.deltaTime;
20.         if (timer >= 12)
21.         {
22.             UpdateSun();
23.             timer = 0;
24.         }
25.     }
26.  
27.  
28.  
29.     private void UpdateSun()
30.     {
31.         int compass = (int)GPSTracker.north; // compass heading with respect to northpole
32.         int sunAzimuth = (int)Sun_API.Sun_Azimuth; // Suns current azimuth with respect to the northpole
33.         int sunAltitude = (int)Sun_API.Sun_Altitude; // Suns current altitude
34.         int angle;
35.  
36.        
37.         if (compass > sunAzimuth)
38.         {
39.             angle = sunAzimuth + (360 - compass);  
40.         }
41.         else
42.         {
43.             angle = sunAzimuth - compass;
44.         }
45.         int radian = angle;
46.  
47.        
48.         Vector3 sunAngle = new Vector3()
49.         {
50.             x = sun.transform.rotation.eulerAngles.x,
51.             y = radian + player.transform.rotation.eulerAngles.y,
52.             z = sun.transform.rotation.eulerAngles.z,
53.         };
54.  
55.         Console.WriteLine("Compass : ");
56.         Console.WriteLine(player.transform.rotation.eulerAngles.y);
57.         Console.WriteLine("PlayerYBefore : ");
58.         Console.WriteLine(player.transform.rotation.eulerAngles.y);
59.  
60.         Console.WriteLine("SunXBefore : ");
61.         Console.WriteLine(sun.transform.rotation.eulerAngles.x);
62.         Console.WriteLine(" SunYBefore : ");
63.         Console.WriteLine(sun.transform.rotation.eulerAngles.y);
64.         Console.WriteLine(" SunZBefore : ");
65.         Console.WriteLine(sun.transform.rotation.eulerAngles.z);
66.  
67.         sun.transform.Rotate(sunAngle);
68.  
69.         Console.WriteLine("PlayerYAfter : ");
70.         Console.WriteLine(player.transform.rotation.eulerAngles.y);
71.  
72.         Console.WriteLine("SunXAfter : ");
73.         Console.WriteLine(sun.transform.rotation.eulerAngles.x);
74.         Console.WriteLine(" SunYAfter : ");
75.         Console.WriteLine(sun.transform.rotation.eulerAngles.y);
76.         Console.WriteLine(" SunZAfter : ");
77.         Console.WriteLine(sun.transform.rotation.eulerAngles.z);
78.  
79.     }
80. }
81.