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    Re: Meridional Distances
    From: Peter Fogg
    Date: 2002 Sep 18, 09:37 +1000

    Thanks for the opportunity of amending the below: '... have tables accurate to 2
    decimal places for each minute of arc for Meridional Parts ... etc'
    As to Meridional Parts, the 1984 Bowditch has tables for M PARTS to one decimal
    place for each minute of arc, my 1983 'Norrie's Nautical Tables' has them to 2
    decimal places. Its important to realize that different tables may be based on
    different spheroid models, and thus give slightly differing values.
    As to M DISTANCES, if Bowditch has them its news to me, and welcome news if they
    have been calculated to minutes of arc.
    Chuck Taylor wrote:
    > >
    > > Although I have tables accurate to 2 decimal places for the Meridional
    > > Parts, the Meridional Distances come only in whole degrees, so need to
    > > be interpelated for in-between values.
    > Peter,
    > Bowditch has tables of Meridional Parts to quite a number of decimal places.
    > The method for computing distances using Meridional Parts is called "Mercator
    > Sailing" and is also described in Bowditch.
    > The introduction to the tables in Bowditch gives a formula for computing
    > Meridional Parts.  I have programmed this into a calculator.  One could also
    > program it into a spreadsheet.  If memory serves me correctly (I'm away from my
    > home library) there is a typo in the formula in Bowditch 95, but Bowditch 80/84
    > Volume 2 has it right.
    > Best regards,
    > Chuck Taylor
    > Everett, WA, USA

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