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    Re: Calculator v. Slide Rule for Ex-Meridian Correction
    From: Francis Upchurch
    Date: 2016 Jan 1, 11:02 -0800

    Thanks Greg,

    Yes, I understand the limited accuracy required for the near meridian ex meridian for Hc and the calculated Hc bit of the lunar. But I think Letcher is saying his 10" trig rule is ok for the LD0 bit of the lunar formula and I'm very confused about that, since he says , on the same page you have to work to 0.1' and need full NA and not the Short tables. So I've stopped using the Bygrave and  BN for lunars and only use the Fuller 2 which gives results essentially the same as a calculator (well, to 4-7 places).

    Maybe I've missed some esoteric mathematical point here?

    Best wishes

    Francis

       
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