[How deduce from shadows, the angulation of the Sun that the Sun is 15 degrees over horizon?
If you look at the shadow of the tractor on the right side of the exhaust pipe you can see that this picture is taken in the early morning or a fairly short time before sunset.

It is not possible to give you a good estimate of what time the picture is taken as this depends on the time of year.

If the picture is taken in early april it is more than one hour before sunset and more than one hour after sunrise.

If the picture is taken in the middle of may it might be whitin one hour before sunset or one hour after sunrise.