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    Re: Longitude sight, South Pacific, 1864
    From: Robin Stuart
    Date: 2018 May 8, 13:21 -0700

    I assume that this is the log from an American vessel. In the limited number of British logs I have looked at the step of dividing the final logarithm by 2

    19.60541

     9.80270

    is avoided by going straight to log haversine tables as shown in the attachment originally from David C,

    Robin Stuart

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