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    Re: Haversine v Versine?
    From: David Fleming
    Date: 2015 May 18, 15:38 -0700

    I have given my Navigation students the formula hav(Zd) = n+(1-n-p)hav(t) as the preferred calculator backup method along with 4 place hav tables and a Rust azimuth diagram.

    Because the solution requires

    a) 4 in head additions - {eg 45d 18m - 10d25m} 

    b) 4 table lookups - haversine table

    c) 2 additions - ( eg abcd + efgh) this strikes me as harder than case a)

    d) and one 4 digit x 4 digit multiply

    e) plus Rust diagram

    The haversine table is really small ( but to my old eyes Hanno has made it factor of 2 too small.)

    P.S.  I think the name for this needs to be distinct from Doniol.

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