What's the actual azimuth of satellite's ?

the offset is 22 degrees.

Azimuth is the magnetic direction of the dish. Elevation of the dish is the angle above the horizon of the dish. Skew is the rotation of the dish around the axis of the signal path.

The settings for a 1000.2 dish are obtained from the setup manual, not the receiver. The Elevation in the setup manual is related to the Elevation setting on the dish assembly.

If you are concerned about where the actual signal path is, you start with the Azimuth direction, the signal bounces off the dish reflector 15 degrees up and then the signal path swings to the right depending on the Skew.

You could try DishPointer.com and see if it shows you the effective signal path in relation to your tree.

The elevation given is the actual elevation angle to the satellite from your geographical location. The offset of the LNB doesn't really matter. We use offset dishes now because some genius got it in his head that it would be wise to move the feedhorn away from the sweet spot of the incoming signal. For your information though, the offset is 22.5 degrees, which is half of 45 degrees, which is half of 90 degrees.