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Hi Sash
If your polar axis is aimed at , for auguments sake, Sigma Octans and your scope is centred on the same star, the 20 cm. or so between your axis' will, projected into space, essentially merge. Think of looking at a railroad track dissapearing into the distance, although the rails are parallel, how far can you see before the two lines of the track merge.
Hope that is an easy way to understand the concept.
Regards
Jeff
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