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Based on feedback so far it looks very promising!!
Think of it as registering a piece of graph paper with a similar transparent graph paper overlay ( both in RA/ Dec)
One is the "actual" sky and the other the "mis-aligned" mounting...
We have one fixed point (the original "sync" star) and by using another distant star can determine how much the "transparent" overlay has to be rotated (in Alt/Az) to bring them into align.
Much easier than three star alignment etc etc - which can still show errors....
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