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    Re: The "golden rule of three" - what's that?
    From: David Pike
    Date: 2018 Feb 15, 13:31 -0800

    I must be a real celestial philistine.  I always have to think twice when I read zenith distance, because I can never remember whose zenith.  I use co-altitude instead; that makes sense to me.  Apart from V=IR, S=VT, and p=mf, I’m not much good at remembering formulae these days, so for mer-pass calculations, I end up drawing a fresh 2D diagram every time.  Then you don’t need to worry about when to use plus and when to use minus in a standard formula. Am I the only one? I appreciate it might be different when you’ve not slept for two days, the doghouse smells of diesel, and a waves just gone down the inside of your sea-boot.  DaveP

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