Sorry, I know I'm cheating. There's probably a celestial navigation list and this belongs there, but...
Can anyone tell me a formulae I can punch into a calculator to avoid sight reduction tables and compute Hc directly? I used to have one, I think. My apologies to those of you who are only interested in sundials and not navigation (although they ARE so similar even down to the careful drawing of lines on paper that I doubt there are any offendees, anyway) jh
