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    Re: Reeds or W Hall
    From: Ducruy Jacques
    Date: 2015 Aug 4, 06:27 -0700

    Hi Paul,

    Another little observation : it seems there are two versions of "methode du meridien estimé" :

    1) english version, with versine formula : vers (L-D) = vers DZ - cos D cos L vers HA ;

    2) french version, with calculation of latitude by the formula of "right angled triangle"(as Borda' double altitude method).

    In my opinion, the english version is only valable between the "limites of circumméridiennes", as we said in french. The french method seems more "tolerant". But it seems that, in France, this method had only a theoric interest.

    Best Regards

     

    Jacques

     

       
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