How does celestial navigation really work? Why do we still use a sight reduction method invented 150 years ago, with paper tables dating from the turn of the last century? How accurate is it? Are there better ways? These questions, and more, are explored in this miscellany of extended footnotes to a course in celestial navigation. The main formulae and algorithms are presented and derived from first principles, along with newer methods which have so far only appeared in the research literature.
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