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    Re: What's "under the hood" of the Raft Book?
    From: Greg Rudzinski
    Date: 2017 Oct 21, 13:05 -0700

    Tony,

    Perhaps there was a different defenition for length of day when the Raft Book was written. Anyway it would be a very crude way to determine latitude. I would rather take a guess at Polaris altitude.   See link to the NOAA calculator for length of day which might be of use as a checker for anyone attempting timing trials.

    https://www.esrl.noaa.gov/gmd/grad/solcalc/sunrise.html 

    Greg Rudzinski

    From: Tony Oz
    Date: 2017 Oct 21, 11:04 -0700

    Greg, thanks for the comment and the kamal implementation.

    My question was why Mr Gatty tabulated the -31' Hc rather than the apparently more correct value of -51'?

    Regards,

    Tony



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