Regarding the calculator/lat-long map page "Satellite dish pointing in Iraq", I have added a dynamic picture which hopefully shows approx how to set the feed polarisation angle, with the LNB side arm sticking out at the appropriate angle.

I hope it works OK.  Please test.

Note that the view assumes you are behind the dish and facing towards the satellite. Clockwise is positive.  Small angles below +/- 5 deg are exaggerated for clarity, otherwise accuracy +/- 5 deg.

Best regards, Eric.