im facing the issue as in the photo below. i want to rotate the y axis to animate it. in HDRs its no issues.if i try to recreate it on a uv sphere i get this ugly distortion. rotating the whole sphere isnt acceptable because of many reasons. i want to rotate the texture only.
so i have found the answer.
use AnimAll add on.
open tools panel by using T then go to Animation tab then check UVs and insert a key frame.
move to another frame then insert another key frame (by using tool menu T)
Move Uvs on any axis then insert another key frame.
go to object mode(will not work in edit mode)
switch to rendered view.
your UVs will animate.