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Message: <blockquote data-quote="Vipersan" data-source="post: 628234" data-attributes="member: 325666">Hi Robbo ..I can see the logic in what you are saying ...and it would be true if the motor stub pointed vertically down .....but because it is at an angle due to  geographical location ....and assuming the motor to be at zero....moving the dish/bracket around the stub to compensate and bring the dish face back into line..would effectively be pre-empting the the dip of the arc ..(you would already be part way down it ..even though the motor was still at the apex) ...and this error would only get worse at the extremes ..At least ..thats how I see it ..Im happy to be corrected ...and am enjoying the debate <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" />rgdsVS</blockquote>