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Not sure if you ever used them Peter, but do you remember "Sight reduction tables for air navigation"? Basically a set of solutions of selected bright stars for a particular latitude and local hour angle. They were used in aircraft as they could give rapid results. The error could be as much as 5 miles, not such a problem with fast flying aircraft. Some ship's officers used to like using them to avoid the tedious working out of sights with log tables.
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