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    Re: Sight reduction methods
    From: Andrés Ruiz
    Date: 2015 Nov 6, 15:47 +0100
    Hi John,

    What if the sands of time are running low (like in the song...)? Nothing gonna happen on a XVIII vessel.

    The main goal of Lunars, now and then, is to get GMT (UT) as you said. But what for?: calculating the longitude by time sight.

    For Lunars apps, see:

    regards.


    2015-11-05 17:27 GMT+01:00 John D. Howard <NoReply_Howard@fer3.com>:

    Andres,

    Nice graph of sight reduction methods.

    I do have a question.  You put Lunar method under Longitude.  I thought a lunar was used only to get a crude GMT ( GAT ) and that that time hack could be used as if from a clock.  Historicaly the lunar method was used before the Sumner line so was used with a time sight to get longitude but can the lunar time hack be used like any other time hack with the St. Hilaire and HO 249?

    Thanks.  John H.




    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/
       
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