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    Re: Haversines with Logarithms
    From: Roger W. Sinnott
    Date: 2020 Oct 17, 21:22 +0000
    Brian Walton wrote:
    > I am trying to replicate reduction systems used by my forefather
    > in around 1890. Reversed sines ( versines) existed in antiquity.
    > Not haversines, introduced in 1905. When did log-sin or log versine
    > tables appear?

    It seems that haversines go back further than 1905. The Oxford English Dictionary cites use of the term "haversine" in 1875, in Redford: Sailor's Pocket Book.

    The graph from the Google Books Ngram Viewer shows a few blips for "haversine" as early as about 1845.

    Roger



       
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