If you set the u_offset to .25 on BB's EnvSphere, it will match the background's default rotation. Then you can turn the sphere to see what rotation you want. Then convert the y-rotation from degrees to radians and set that in the background's rotation if you use the setup here https://www.renderosity.com/forums/threads/2961030/rotation-when-using-an-hdr-bitmap-on-the-background-node. It sounds way more complicated than it is.

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