![]() ![]() My old copy of 'Bowditch' ( American Practical Navigator ) lists nearly 60. As few of us are entirely comfortable with doing that from first principles, scores of shortcut methods have been suggested over the years. The difficulty is due to the process requiring some capability with manipulating spherical trigonometry to 'reduce' ( resolve ) a sight into a usable Line of Position. My 'astro' bookshelf has more than a score of 'how to do it' books, and I've binned perhaps another score of 'em along the way. I've been doing this stuff over 30 years - The Queen paid for me to learn - and more recently I've taught it. The same applies to 'how to do it' books - there are many of them, and only a handful are first-rate. This question comes up fairly regularly, and lots of peeps offer the stuff they happen to use.
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