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    Re: Hav-Doniol re-visited
    From: David C
    Date: 2020 Oct 24, 21:08 -0700

    Greg wrote

    The original 1955 Doniol method uses a natural cosine term and haversines. The Hav Doniol method uses only natural haversines.

    Thanks. I have now reduced a sight using the hav-doniol method. In fact I have learned two methods because the 1955 doniol and hav doniol methods differ only by hav, sin and cos.

    I was daunted by multiplying two five digit numbers longhand. Then I noticed that in your ocean navigator example you  used only four digits and all of a sudden I was able to do the long multiplication. Are fouir digits sufficient?

       
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